New with ovulation tests

Hi everyone!
I'm new here, and new to using ovulation tests.
I'm already a mom of 2 kids (11 and 7 years old) and I've been trying for a 3rd for 2 years. Since this month, my gynecologist has been monitoring me so I know when my ovulation occurs.
Last Monday (26/4) I ovulated and obviously had intercourse every other day.
Since Tuesday I started using ovulation tests because I was afraid the doctor might have been wrong about my ovulation timing.
Since Tuesday I've had 2 negative tests on the same day (faint line) but the test I just took... was bright positive (2 thick lines). Unfortunately I can't upload my photo yet, still figuring out how.
Should I assume that I actually ovulated later than expected? My cycle is very short, usually around 24/25 days.
Or could those tests possibly be reacting to hCG... tomorrow will be one week later and I still have mild cramps in my belly every day.

Who can tell me more..
Love.