My boyfriend and I had unprotected sex early March 28th later on that day I took plan b, he did come inside me... Then I get my period April 8th and we have unprotected sex again...he comes inside me. I thought nothing of it because I know my ovulation. Could it be possible that plan b changed my ovulation? I've been feeling sick to my stomach at times, having constipation, headaches and back pain. When could I take a test? Sorry for all the questions just really unsure