19 almost 20 weeks and no weight gain, when to worry??

Alex

This is my 4th pregnancy and usually I struggle to not over gain but this time I haven’t gained a single pound. In the first trimester I wasn’t concerned but now I’m entering 20 weeks and no gain yet. I see my OB in a week or so but I’m starting to worry.

Anyone had this happen and had a healthy baby at the 20 week scan and on???