I took my birth control pill last month and got my period normally, then started taking my next set of birth control pills once my period was done, but after the first week I ran out of birth control pills and could not get more until later in the week. So I got my period again within two weeks of my last period ( I take birth control to get regular periods) and on the second day of having my period I had unprotected sex. So now I'm thinking I should take the plan b pill because when I googled if you could get pregnant on your period it said its more likely if you have a short time in between periods and that's what happened to me. Should I take the plan b pill? Please help, I'm so confused on if I should waste the money on plan b.