Quick question...

I'm 16 weeks pregnant and this is my 3rd pregnancy! My stomach is looking huge but I konw that this is because my stomach muscles have decided to have a holiday!! If I catch myself in the mirror and suck it in a bit then I look considerably smaller but I just read that its not a good idea to do that.... so do I just let it all hang out!? Feels a bit weird not tightening my stomach muscles a bit!??

Anyone else in this situation!?