I have done 4 tests the first and 3rd had faint lines and the 2nd and 4th were negative…

I have done 4 tests over the last week. The first one was very faint but showed up in the first minute so I did another the day after to see if it was an indent or actually a line, the test from the day after was negative. My period is 3 days late, (but I did ovulate 4 days later than usual). So I tested again last night and got the below test…. With a faint line again. So I tested again this morning, and the test was negative again. The line on the image below showed up after about 2 minutes. Valid until 10 minutes. The picture was taken at the 3 minute mark.