I've been on the Pill for 8 months now (Microgynon 30) and have never had any problems with it. Last weekend (17th July) I had unprotected sex, and I finished my 3 week pack on the Monday. I should have started my period yesterday, but instead there's been a brownish discharge and only the smallest amount of blood when I wipe. I have a very slight cramp today, but still no signs of an actual period. Could I possibly be pregnant?