I am on the pill and have regular intercourse with my partner. I skipped the week off the pill as i was on holiday. I have been on my new packet for about a week and have had really sore breasts and nipples for the past 2 1/2 weeks. They are so sore that it hurts to get a bra on comfortably. Can i be pregnant or can the pill cause this through hormone changes? Please help im very confused.