Hi, I tried to reply last night but then my stupid computer crashed! You should ovulate 14 days before the beginning of your period if you are regular that is.
The other signs of ovulation are an increase in discharge and it becomes stretchy (sorry if thats tmi!) This is to help the sperm swim to the eggy!
The best thing to do is to have sex 2-3 times every week and there will always be sperm waiting for when you do ovulate. Don't become obsessed like I did cos it stops it happening!