My boyfriend and I had sex tonight (with a condom and he pulled out before), but before we were kissing and his penis touched the outside part of my vagina. He had some precum that touched between my inner thigh and vagina. He had cum earlier, so I'm aware his precum could contain sperm cells. I'm paranoid that, despite the lack of penetration, I could become pregnant (not ideal). I am supposed to start my period in 6 days, so I feel like my chances are slim because I'm not ovulating and it was just precum, but I'm worried. Should I wait and see if I have my period or obtain some sort of morning after pill?

As a side note- I'm starting on the birth control pill after this coming period so I don't have too much to worry about.