Sorry if this question is gross but I just wanted some help. The night before last my girlfriend was out of town at some old friends house. A lot of people stayed there that might including her ex-boyfriend. Well when he was talked about she said yes he was flirty and stuff but she of course wouldn't, and didn't do anything with him. Well she came back and stayed with me last night and everything seemed OK but I still had a weird feeling, maybe just scared or insecure because I had been cheated on before.. I don't know. Well today after she went to work I was picking up our clothes off the floor. Well when I picked up her black underwear I noticed a very large white stain in the crotch area. My first thought was, "oh no, she cheated on me". After thinking about it and reading online I see that most women have these stains everyday, some more than others. Also that if it were semen it wouldn't be white. Can anyone help me with this, I hate to bring it up to her if there is no need. Thanks.