Okay so I'm on birth control but I don't usually take it on the exact same time for instance I'll take it 8:35 one day and 9:23 the other day and then I'll keep the consistent time of 8:35 for the rest of the days I take. I got off my period 3 days ago and me and my boyfriend yesterday had unprotected sex , he pulled out and did ejacualte on it near my vagina but this morning I woke up and saw that there's white stuff on my underwear that looks like dried up sperm , and it's not on places where I usually discharge at, if he got some sperm on my underwear and I put them on not even five minutes later could I be pregnant?