I have some ocd so forgive my question. i masturbated in bed and afterwards left my room and sat on the family living room couch briefly then left again. if a female family member sat on the same spot on the couch, can she get pregnant? sorry ocd?

Pregnancy is not possible in above mentioned circumstances. Contraception remains otherwise key in avoiding undesired pregnancy and associated anxiety when intercourse is likely to occur. OCD is likely causing your distress.

No. The OCD is a problem and needs professional treatment, generally with medications and talk therapy. One can see his primary care doctor for starting treatment and referral recommendations, either in-person or via video. The other stuff, masturbating, leaving traces of semen here and there, couch-sitting, are typical events across the globe and happen to everyone, so surely not the issue here.