Please help me get some closure.

My bf didn't inform me he masturabted hours before he saw me. But he didn't remember if he urinated or not the throughout the day.He came over and I gave him head for a little bit. Is it possible I sucked out the remaining sperm left in his precum? I always notice it starts getting sticky when I suck and I always spit it out. I let him put in his penis In me for about 3 minutes without a comdom because we wanted to know how it would feeI like.I am 15 please help. I'm afraid. I'm planning to get on birth control and I now have an appointment on the third of August.