Normally, a woman is most fertile when she ovulates which is 14 days after the start of her period. There is typically a 2-3 day window at that time. Unless your cycle is off, you probably won't conceive on your period. It *can* happen, but it isn't your most fertile time. There aren't really any positions that guarantee pregnancy. Assuming you & your DH/SO are healthy, his sperm should be strong enough to fertilize your egg whatever position you are in. That being said, sometimes it can help if you are in missionary position & stay there for a few minutes after he finishes as the theory is that the sperm have an easier path to travel. Good luck!
at 12:12 PM on Jun. 30, 2009