I had unprotected sex on the 28th of july, it was the last day of my previous period. On that day I took my triphasil pill an hour late before the act took place. During that time I took my pills on time up until sunday last when my pack finished and I didn't have a new one to start so what I did was I took a trigestral pill and counted the days before I usually got my period and took that one. The next day I bought my pills(triphasil) and immediatly took the one I missed and the current days pill. I received my period a day late, my confusion is I'm not sure if this is break through bleeding or my period? It is quite light, and I usually have a average flow, not too heavy. So all in all my question really is could I be pregnant? And is it break through bleeding or just my period? Please help? I'd appreciate an answer