What's this about?!

Inger-Anne
I've always had regular periods. I had a positive ovulation test on day 14 of this cycle, just as normal. Then on day 18 I started bleeding. A lot, like a full period, and it lasted for 4 days. Then right afterwards I had every sign of ovulation again, and now I've had positive ovulation tests three days in a row. And today ( day 24 of cycle) I have these tests
The top one is an ovulation test. The middle one is a pregnancy test, but I didn't check it until several hours afterwards. (completely forgot!)
The bottom one I took now when I discovered this line, but now it's negative again?! I'm confused!! Help?!