Losing weight

I am 17 weeks pregnant. My starting weight was 210. I am now at 201. I lost 4lbs in one week two months ago because I was super sick. This last week I lost another 3lbs. I am not sick anymore. I don’t know why I am losing weight so fast. Last appointment my doctor wasn’t concerned. I’ve been trying to eat more-idk I guess I’m just worried. Did anyone else have trouble gaining weight?

This is my second pregnancy. First one I gained 50lbs. So this is very new to me. I am 5’2” so I have weight to lose.