Could I be pregnant already?

My husband and I are try for our 2nd one. This is our 4th month trying and we've decided to use ovulation tests to see when I'm ovulating. Well we bd about 4 times a week in the weeks before my ovulation week. And about 5 times a week the week I'm ovulating.This week I should be ovulating and I've been doing the tests since the day after my af stopped. Well since the day that I've starting doing the tests I've only been getting the control line coming up. Even this week I'm only getting the control line. My question is could I be pregnant already if the other line isn't showing up or should I keep testing next week and just see if I ovulated late?