There are 2 types of bcp, one is a 21 day pack and one a 28 pack. The 21 day pack you have a break for 7 days after the pack is finished, during that break your period will come - normally 4 days after stopping them, the 28 day pack you take continuously, the last 7 days are different pills and you get your period when taking those. If you haven't found a donor yet and you are at the end of your 21 days you would normally have the 7 days off, get a period and start on another pack. They will be keeping you on bcp as its easier to synchronise you to a donor to do a fresh cycle. Yes, lol, bcps at our age (don't know how old you are) but I used to think "what if I had an ooops pregnancy that month and stopped it because I'm on bcps - a load of rubbish but I bet lots of us think that. Good luck finding your donor and with your upcoming cycle.