Pregnant?

My boyfriend and I had sex for the first time last Saturday. He wore a condom, but he finished before me and continued until I finished a bit later.

I have read that if you do this, there is a chance the semen could spill out and get you pregnant.

I was on the second day of ovulation.

5 days after I had mild cramping and my blue underwear had a purple spot that looked like I could’ve been spotting.

Are the chances of being pregnant high enough that I should buy a test when I can, or should I just wait and see if I get my period?

(Also we are 23 and 24) so even if we did get pregnant we have plans of how to take care of it.

If this has happened to anyone else, I’d love to hear your results.