So sorry to hear about your son.
I've been delaying telling people too. I'm 20 weeks now and quite a few people know, but I didn't want to tell my elder children until after the 20 week scan if I could help it so I was trying to keep people to 'suspect' not 'know' IYSWIM.
I found that staying in normal jeans/trousers as long as possible helps. Even if you have to have a hairband keeping them up because you can't do the button. Maternity trousers are so stretchy they don't support anything or hold it in at all!
Then loose, long tops on the top half, with big drapey scarves if you can. I also got this cardigan. It is a bit like a waterfall cardigan but without the frilly bits! So it sort of hangs down either side and breaks up the line/distracts the eye. Also, if you feel exposed, you can kind of wrap it around yourself with your arms and claim to be cold.
When wearing a coat, hands in pockets distracts from the fact that it is a bit tight across the tummy. As does stuffing tons of your kids stuff into the pockets so it looks like the overflowing gloves, hats, water bottle, etc are what is making it tight!