Hi, my bf and I were not dry humping, he just picked me up but when I got down I saw a small spot of precm on his shirt that touched near my vagina (I was wearing thin leggings and underwear; he had on underwear, shorts and a shirt). After I went home I wiped with toilet paper and changed my clothes and then I masturbated. Could I be pregnant? My period is a day late which is pretty normal I guess but I'm still so paranoid because he had on 3 layers yet it went through and made a small spot, so could it have made me pregnant? Especially after I masturbated even though I washed my hands?