I'm 18 weeks right now. I never touch my stomach. Later in my pregnancies, I certainly do. I get that lots of women want to connect with the baby, and the pain reason makes a ton of sense; but it seems near constant that her hands are on her bump. When she is doing professional presentations. It's one thing on a walk about, in between shaking hands. It looked crazy during the British Fashion Awards. Especially since it was double handed so much. She looked like she was holding on to remind people she wasn't fat.
However, I think my issue with it is that it appears to be a crutch because she doesn't know what to do with her hands. Michelle Obama is a great example of being able to speak without needing to hold something. It's a good skill to learn.

But how constant is constant? And how would you know in any case? You really seem to be projecting with that "remind people she wasn't fat" reference! I think you are very off-base with that out-of-left-field characterization. It really is Meghan's business how she presents herself in public during her pregnancy, after all. Plus, we really are not getting to see glimpses of Meghan 24/7.
The Duchess of Sussex hasn't been doing a lot of public appearances since coming back from the South Pacific tour. The other night at the fashion awards event, I thought Meghan looked glowing, happy and very graceful. Whether or not embracing her baby bump was a comfort gesture due to feeling the baby moving, as some have suggested, or just simply Meghan feeling proud and enjoying her pregnancy and her femininity, I applaud her ability to be spontaneously in the moment. No matter what she does, there's going to be over-scrutiny and criticism, so she might as well enjoy being herself. Like she and Harry said in their engagement interview: they ignore the noise, and per Harry:
"Whatever obstacles we have to face, we'll face together..."
Your speculation about Meghan needing a crutch to hold onto is all kinds of silly. What do you mean anyways? I think everyone has nerves when all eyes are on us in public, but Meghan is used to that, and she handles it all very well. The way she walked in was so graceful. She has such lovely posture, even in pregnancy! Since she's been practicing yoga from the age of 7-years-old, I would guess that she's very comfortable with and in-tune with her body.
As far as Meghan needing something to hold onto when speaking, well yes, she was holding the microphone, and the award envelope, and in the past, she's held onto the lectern when speaking, and she held onto both of her hands occasionally when she gave the brief speech at the public launch of her Hubb Community Kitchen project. And every time, she's always been so eloquent! And she writes her own speeches too!
Apparently, Meghan has always been a confident public speaker. Here she is around age 13 giving the keynote speech at her middle school graduation:
https://royallysussex.tumblr.com/post/178324282250/team-sussex-meghan-has-always-been-a-confident
https://www.youtube.com/watch?v=tfaGleA4qYo At age 11, very articulate
https://www.youtube.com/watch?v=Zkb-zg4JCLk U.N. speech 2015
https://www.youtube.com/watch?v=aq0tvm1zTFM Hubb Community Kitchen cookbook launch
https://www.youtube.com/watch?v=TZQiB1ChLAQ speech in New Zealand
https://www.youtube.com/watch?v=U7yGJ7Vic8k speech in Tonga scroll to 2:23
https://www.youtube.com/watch?v=BuBk1rIIxqI speech at Invictus Games in Australia
https://www.youtube.com/watch?v=qtl9mnEoZUY interview with Larry King, early 2016
ETA: Here's a revealing video of Meghan in a USA Network public service campaign (2012), speaking about her experience of being faced with racist attitudes:
https://www.youtube.com/watch?v=mmEnNAy80ak
One thing I notice, and it has been commented on a lot is how Meghan often touches her hair, smoothing it back from her face. To me it seems like a nervous tick or mannerism. But whatever, nobody's perfect. She is really very accomplished, but at the same time, she's written and shared a lot about overcoming obstacles and dealing with challenges in her career as an actor. She seems like a person who tries to learn from every experience and to look at life glass half-full. She used to post so many encouraging quotes/ words of wisdom on her Instagram:
https://www.youtube.com/watch?v=nXlZtmZ8F6k
Meghan certainly had an amazing, busy and fun-filled life before meeting Prince Harry. Her friends and
Suits castmates in her former life must surely miss her. Hopefully, she finds time to stay in contact with closest besties like Jessica Mulroney, Lindsay Roth, Abigail Spencer, Benita Litt, Misha Nonoo, and especially Markus Anderson (who appeared to be like an older brother to her -- there were lots of pics of him on her Instagram). One thing about Meghan's notoriety post-Harry is that she was unable to attend her close friends' Serena Williams' and Priyanka Chopra's weddings.
I wish the Sussexes well -- what they have appears to be such a beautiful, inspiring love story:
https://www.youtube.com/watch?v=Buj1VvxJW7M montage to
Beautiful, by Mali Music
https://www.youtube.com/watch?v=bCe8xFSrCwc montage to Ed Sheeran's
Perfect