Feeling uncomfortable

I am 13 weeks pregnant and I just feel so fat. I have already gained weight and nothing fits me ad it's freaking me out. I feel so unattractive that I don't even want to have sex I don't want to be looked at .  I just don't know what to do to feel better and its putting stress on my relationship. Does anybody have any suggestions on how I can feel better or what I can do to boost my self esteem ???  I would really apriciate it ☺️☺️