Suggest Treatment For Severe OCD During Pregnancy

Hello, I am 5 weeks pregnant and some terrible thoughts don t let me enjoy this period..all my life i was afraid of getting pregnant by sitting on the toilet seat, i suffer from OCD. I had terrible fear and was hard to cope with it...Now I have beloved husband, i would never cheat on him, he is the one and only in my life... he is the most important to me, but thoughts that i got pregnant not by him, but by sitting on the toilet seat with some sperm on it..oh..it kills me!, i cannot live a normal life. Last month we were on holiday and i can t stop thinking that toilets in hotel room were not clean...that some person ejacuated there before we moved into the room and so on...i tried to make myself believe that all rooms are being clened before new guests, that sperm cannot live long and would dry up..and i would have seen it if it were there..all in all- there were nobody, rooms were clean, why some person should do that????.but still..i am sure that i touched toilet seat with my vagina several times really hard, because i doing my nails just after the shower, naked, sitting on it..and i remember myself wondering i sit like this...maybe it is not clean... and now i simply cannot stop thinking that there was something on that seat...please, calm me down, that it is impossible to get pregnant this way...the one and only person i ever slept with is my husband....