Trying to pinpoint when I ovulated got my light positive test today!

I stopped taking birth control pills in January and used protection for that month and for the majority of February. My husband and I tried to have sex at least once every other day starting March 1st. My first menstrul cycle off the pill was on 2/16/15 which was 35 days after my last period on the pill.. I'm not quite sure when I ovulated and I have taken 3 first response tests over the last few days each test getting a stronger faint positive. 😬 I just have no idea how far along I am at this point. Any ideas ladies? According to an <a href="https://play.google.com/store/apps/details?id=com.glow.android">ovulation calculator</a> it could have been march 2nd or 9th.. is it too soon for me to be having a positive pregnancy test if I did ovulate on March 9th?