My boyfriend and I have been having unprotected sex for about a week the last two times where a day before my period started and the day it started on he finished in me all those times . We had sex 2-4 times a day for a week straight . I'm 25 don't have any children yet and wanted to know how much of a chance do we have at conciving?

So do you track your most fertile days, if you are trying to become pregnant? It is best to have them on those days.

But yes since you were doing it so often and with no protection, it is very possible you can be.

There are many chances to get pregnant if you do sex in periods or ending of periods without protection

I found some answers here it may help you

Sex within Monthly Periods

how to get pregnant

But try to take care always in periods.