Hi, my fiance and I were intimate towards the end of Oct she took a Plan B pill around the 1st of Nov. She then got her period on the 10th of November, which was just days after taking the pill. We were then sexually active again on 22nd-23rd of Nov in which I used protection, I didn't ejaculate inside of her instead I pulled out with a condom on the whole time. Now she is 3 weeks late on her period skipping the whole month of December. We both are worried sick and we've taken about 4 pregnancy test First response and Clear Blue and all four test show negative. Is she late because of the Plan B pill? Today's the 1st of Jan 2015 and still no period. WHAT DO YOU RECOMMEND PLEASE HELP!!