I think I might be developing an allergy to semen After BDing tonight (after I stood up and it ran out), I felt weird down there and when I looked, it was a bit swelled and red. Simliar to when I got the allergy to PreSeed, but not as bad and without the burning. I really can't remember if I felt this the previous months of TTC. I don't think I did. I hope I'm not allergic to sperm, because that could prevent me from getting pregnant, couldn't it? My immune system might be killing the sperm!