HELP?!

I am 19 and my boyfriend is 21.

I had my period March 6th and 7th. I just spotted the 8th and 9th and didn't take my birth control those days because the pharmacy was out of stock and I had to work so I didn't have time to go out to a city an hour away from me.

We are going to be getting saucy tomorrow and since I am still spotting, but didn't take my birth control yet for 2 or 3 days, is it pretty impossible to get pregnant?

Or do those 2 days after my period matter? I am still just spotting teeny teeny bit.

Can he creampie me and I not get pregnant..?

How chancy is it would you say?