Feeling down

Lately I’ve been feeling so self conscious and just insecure. I had a baby 6 months ago. I feel so disgusted by my body . It’s starting to interfere with my relationship. I’m scared he will find someone skinnier,or prettier then me . I feel like I’m pushing him away because of my insecurities. I am a SAHM also so my life revolves around caring for my 3 year old,6 month old.and fiancé.