Is there a cheap, inexpensive way for a woman to test her level of fertility?

I've seen kits for guys at Walgreens to test their sperm for fertility. It's about 33 dollars. Is there anything like that for women? I'm curious to see how fertile we are as a couple. I'm not trying to have children right now, so it's like I can try to get pregnant to find out. lol
John T, why buy the cow when I can get all the milk I need from my husband, for free?