i just started birth control on january 31st. my boyfriend and i became sexually active on the 13th of this month and the last time we did it was on the 15th of this month. i haven’t missed a pill, he used condoms and pulled out. my period just started today or so i thought. when i took out my tampon- my blood is thick and slimy. this isn’t normal for me before i started the pill. is this normal when starting the pill or am i pregnant?