can someone leave helpful advice & not ignore my post

Last month (March 14) put on an antibiotic that could effect my birth control only took It bout 3 times & didn't have sex till the weekend. ALWAYS use the pullout method, last week I missed a pill so doubled up the next day. This week is my period week normally comes Tuesday or Wednesday. Now it's Thursday & I still don't have my period. I'm paranoid & very scared.  I feel SLIGHT cramps which is easing my mind a little, & I do feel very emotional. My boyfriend & I tend to have sex very often but I'm protected with birth control & he never Cums in me