Hi, I was prescribed Ethinylestradiol in Apr 2010 to delay my period for a holiday. It worked just fine, no side effects. I have never been on the pill , pretty regular periods. I still have a few of those pills from that batch. I need to postpone my period that is due to start on the 27th Feb (last period 31st Jan). I will not be able to get a new prescription until then. Are those pills still valid, can I take them? Thanks