Try getting an ovulation prediction kit. That will tell you when you should be ovulating. Good luck to you.
also if you call your doctor they can order a blood test to test the quantity of hcg in your blood. those tests.are.more accurate.
Still possible to get a positive wait until the day your period is due
I bought five tests. Four were negative. Two weeks after missed period I got a positive. Hcg levels may be too low yet.