question??

so I'm on the pill, however I finished my period and almost a week later, on cycle day 6, I had unprotected sex with my boyfriend. he came inside of me but a lot of it spilled out. is it still possible that I'm pregnant?
something like this has happened before but I didn't end up pregnant that time. I haven't taken any tests yet and according to <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">Eve</a> my periods supposed to start in 13 days