my unshakable fear

I've been dealing with a fear of my 6 month old daughter being sexually abused or molested by my husband/her father. I looked it up and I believe I have postpartum OCD or anxiety but how can I figure it out. I've become obsessed with this fear it makes me sick. I check up on her throughout the night like 5 times. I fear of hurting her and I fear of my husband will sexually abuse her. I always get flashes of me dropping her on the floor her and I always get flashing thoughts of my husband touching her. At first I thought it was intuition but now I feel crazy. Does anybody know about this? It's slowly ruining my marriage.