lurking -

You only ovulate on 1 day, however you are fertile for up to 5 days (I believe) before you ovulate, because the sperm will survive in you for up to that time. Besides checking your cervical mucus and charting your temps and checking the cervix position, if you don't want to do that, you can always purchase OPKs. It's a little strip, just like a pregnancy test, where you pee on it for a few days and as you are getting closer to ovulating the test line will get darker. When it is as dark or darker than the control line, then you will ovulate within 24-48 hours. Read the instructions on the box for exact timing.
Also, for myself I know exactly when I'm ovulating because I have incredible pain on that day. You just have to basically watch for your body to tell you what is going on and 'Taking charge of your Fertility' explains everything. Good luck and I hope you get your boy!