Ovulation and Preg Q

This is my first post to Glow so please be gentle! I'm 29 and had a miscarriage this past November. Just recently I started tracking my ovulation cycle again. This is the first time since my miscarriage I've been motivated however my husband and I have been "trying" ever since. My Q is, I've been ovulating the past 4 days and today has been my first negative. We've been trying these past four days, could I still be pregnant?
I only ask because I see people that ovulate for more than 1 day and woman say "oh that surge could mean you're pregnant". Do you constantly show a positive on your ovulation tests if you're pregnant or could you stop showing a positive on your ovulation tests and then still show a positive on a pregnancy tests in a couple weeks. 
-skeptical and hopeful Stefanie