I didn't gain anything till my 6 month but I'm definitely making up for it in my 7th. No worries everything is just fine
It's normal, I was the same until I reached the 20 week mark & I gained weight rapidly. I was 129 pre pregnancy weight & never gained a pound till 20 weeks & I'm 174 & 33 weeks & five days
Its normal to not gain weight and its normal to lose wait during pregnancy