I'm on birth control. I forgot to take my pill and had unprotected sex (he withdrew before finishing, but there's still risk). The pill I was supposed to take was the last pill before I was supposed to start taking the dummy pills and have my period. I took Plan B just in case. The pharmacist said I should take the dummy pills and should have my period. I will be starting the 5th day of my dummy pills and still no bleeding. Should I be concerned and take a pregnancy test before I start my regular pills in 3 days?