I stopped taking a 5 day cycle of antibiotics two weeks ago. Had three days of active BC pill use and then was off for because of my period. Started (on time) the following week with my active pills and had sex (without a condom and he ejaculated in me) two days into my new pack of active pills. Has spotting this morning and then it stopped, started again later tonight and stopped. Could I be pregnant? I know that antibiotics effect bc, but I was on my period the following week and then started my new pack. Please help!