What’s the latest you’ve gotten a positive test after negatives?

I had sex w/ ejaculation on April 7th and the next day had “egg white” cervical mucus for the first time in a long time, making me think maybe I ovulated. I don’t have regular periods. For the past week or so I’ve had all sorts of symptoms including things I’ve never experienced before like darkening areolas and constantly hard nipples.

I’ve been taking home tests this week and they’ve all been negative.

How much longer should I keep testing?

Has anyone still had tests be negative at this point and end up with a positive later? I have a doctors appointment scheduled but it’s not for like two more weeks