BFS mom keeps commenting on my weight

I’m 21 weeks pregnant. I have put on about 18 pounds so far I will say, which I’ve already been self conscious about my body.

Since being 10 weeks, she has mentioned something about my weight gain THREE separate occasions. Most recently, Friday, on my 27th birthday at her house, while eating cake and ice cream. The crazy thing is— she is predominate in Church being the PASTOR, and she always has something negative to say. It’s really starting to get on my fucking nerves and makes me NOT want to be around her.

Advice???? Cause one of these days I’m going to freak the fuck out on her and I’m afraid it’ll affect mine and my boyfriend’s relationship.

Keep in mind, SHE ISN’T SKINNY by ANY means. She is a heavier set lady.