Is stress hurting my baby?

I got into it with my boyfriends step mom today. I told her if she has any concerns about my pregnancy (she asked my boyfriend if I was drinking behind my back) she can come to me directly. I don’t feel as if I came off rude but she must have taken it that way because she got defensive immediately and started throwing all kinds of things in my face, most of which weren’t even true. It hurt my feelings so much and she didnt even care. I’m not doing anything to hurt my baby and her asking if I was drinking really bothered me. I didn’t drink much before and sure as hell haven’t been drinking while pregnant. I’ve been so stressed and hurt by this today and I started cramping not too bad but more than usual and it worried me. I’m trying so hard not to stress but it’s all I can think about. What should I do?