Are your periods regular? if they come every 28 days, you probably ovulate day 14.
That means the best time to have sex
to conceive is days 10 through 15. the sperm
can last up to five days but once you ovulate the egg only lives for about 24 -48 hours. the best way to know if you're ovulating is by purchasing and using an LH surge kit. The LH surge occurs the day before you ovulate