I NEED SOME ADVICE!

Okay, so my period is WAYY late. I just had my second son this past December and my period was pretty regular until August. My period was August 18-24th and is usually 7 days. But then I started bleeding the week that I was supposed to ovulate (Sept. 4-8) and it was only those 5 days. I have not had my period since. I’ve taken 8 pregnancy tests (different brands first thing in the morning) and they’ve all come back negative.

At first my husband thought it was because I was stressed, because that tends to happen, but it’s never happened for this long before.

Idk if I should continue to wait it out or go see a doctor.

Has anyone been in a similar situation? If so, what would you suggest? TIA