Nasty sexual feeling

Not 100% sure where to post this but I was messed with when I was like 4 or 5 wasn't raped but touched an I use to get this nasty wrong sexual feeling down there hard to explain it but it eventually stopped a few years ago but now I'm pregnant an its just started coming back I don't know why. I've never been comfortable around men not even family it was my grandma's husband that did it but I find it uncomfortable to even be around my dad I don't talk to anyone about this an never really have but we're staying the night at my dad's this weekend an I just feel nasty someone help