Ladies Help!!! Has anyone experienced positive ovulation tests for 4 days?

I have been testing for ovulation for months now. I have been trying to conceive post depo for a year. In the past couple months when I test I go from no test line to a test line so close to the color of the control line I couldn't tell whether that was positive, or both lines would be the same color except for a little sliver of the test line being darker and I don't know if thats positive either...

So anyway, the last 2 months I have been trying the CB digital smiley face and first response kind. Last month I got a smiley face for 2 days. BUT this month I have been getting smiley face for 4 days and on the FR the test line has all the dye as it is as dark as it can get and the control line is a faint pink. I thought it might be the test but the lines on the CB after being ejected from test are the same way and this is happening on every test for 4 days. Yes, I absolutely read the tests with in the time frame, they were all positive within 30-40 seconds.

Could this mean I ovulated this month for sure and maybe just had increase hormones last month and did you ever experience such a long surge? I also have a light headache and slightly cramping this whole time which I normally have as the line gets darker.

Sorry this is soooo long but we really want a baby. I'm also kinda excited and I'm trying not to get my hopes up. thanks in advance!