<s>[INST] I have been on Loestrin 24 for about four years now.  I started Flagyl on Nov. 21, 2011 for seven days.  I got my cycle on Nov. 26, 2011.  I finished taking the Flagyl on Nov. 28.  My cycle went off on Nov. 29.  I had unprotected sex on Dec. 4.  Should I be worried about being pregnant. [/INST] Flagyl has nothing to do with you getting pregnant. what matters is are you still on Loestrin regularly or not. If you have stopped Loestrin and has had unprotected sex you should run a pregnancy test. </s>