I am 5 weeks pregnant with severe diastasis left over from my previous
recent pregnancy. The diastasis gave me a distended look that I was
able to somewhat mask before getting pregnant with #2. Sometimes I wore
Spanx or just wore flowy things. Obviously, I would not wear Spanx
now. Now that I am pregnant, I'm learning that there is a difference
between the distended look versus the pregnant look. My belly has
started to pop already. I am trying to not make it obvious at work and I
am spending a lot of time behind my desk. My boss is such a busy-body
as it is and I know she will be wondering "is she or isn't she?" The other day, when she saw me eating a salad at 4 pm at my desk, she said, "Are you pregnant again?" (At the time, I wasn't!) I'm
wondering how long I should hold out. Part of me just wants to "come
out" since then I will feel less awkward and can bust out with the cute
maternity dresses, which will be more comfortable to wear. The other
part of me would like to wait until the usual time people start to
tell. The reality it, I'm not sure I will be able to keep it a secret because of how I look. Advice on how to handle? (Also, any advice on how to respond to comments like, "wow, you're only 5 weeks... you're huge!" would help too.)

Re: Showing at 5 weeks (diastasis)
I hope people don't say "you're huge!", but they inevitably will because people are just rude. I always just say "oh" or "thanks" depending on whether I'm thankful for their comment or not
And about waiting or telling, I'm not a private person and would just tell. That way, people don't end up finding out on "accident" because they make an awkward joke or whatever. And you have an excuse to eat at your desk all you want