I have been taking Sprintec faithfully since late October. But, for this month of December, my pack ended on the 23rd. I was supposed to start a new pack Wednesday the 24th but I decided to delay it because of how my period was working out. My period ended the 23rd as well. So I started the new pack Sunday the Sunday after my period was over, which was the 28th (yesterday). My boyfriend and I had unprotected sex today and he came inside of me. Is there a high possibility that I may get pregnant? If so, should I invest in Plan B? If I do invest in Plan B, could I take it Wednesday (that's when I'll have the money) if this happened Monday (today?)