I had sex while Taking the z-pack on my sugar pills ,but I had two days left on my sugar pills.The neXT day I freaked out and started my day one of my new pack.haven't got my period yet. I take my pills religiously and never miss a pill This was 6 weeks ago. Took 4 tests all negative. I had sore breasts and nipples, but it has gone away.do you know what is going on? I do have anxiety maybe I'm freaking myself out??