vague

Hi, I'm on day 5 of my period and I did 3 ovulation tests just for fun, and they all showed a pretty dark, thick line. How is that possible? My cycle was 39 days this time, so we initially thought I might be pregnant because I had the symptoms, but the pregnancy tests were negative... My blood is also lighter than I'm used to... and there are some dark, thick things in my period that I've never seen before... But what I find strangest is the ovulation test result now... I'm still bleeding a little... I have a lot of pain in my sides and the middle of my belly...