I used the ovulation kits as well but we had sex every other day from the day my period ended until CD20. And that worked for us the first month trying that. But everyone is different. It can take up to a year to conceive for a healthy couple. So be patient and sending baby dust your way.
It took me a little over a year to get pregnant after I quit taking birthcontrol, which I had been taking for about 5-6 years. Good luck!
Well it sounds like your regular, which is a good thing. Are you having sex the days leading up to your positives, and a few days after and during? It's important to at least have sex every other day throughout (in your case) day 10-18. Good luck hun!