If you're savvy you'll know what I'm trying to say
When I say "I'll settle for 'I love you' anyway"
I could tell you that I cut you out of stars
But it's just a ghost of what I'm feeling in my heart
you can buy ovulation testing kits- really cheap on ebay- you can get sets of 15/50/100 test strips. it tests the hormones in your body- so if you know just a rough date, wont hurt to test every day
If you buy cheap ones, it's worth also shelling out for the branded ones at least once and testing that the cheap ones are working. I bought a load of cheap ones a few years ago, and they never gave a clear positive result, even though clinical tests later confirmed I was ovulating normally.