I don't even know what to say.

Hi ladies,

I'm new here, and I'm dealing with a problem. Maybe there's already a thread about this, but I figured I'd just start a new one anyway.
I always have a cycle of 28 and sometimes 29 days.
We've been trying to get pregnant for a few months now. But every time I unfortunately get my period..
This month that's not the case though, I'm already on day 36!
And I'm feeling nauseous in waves, little stabs in my lower belly especially on the left side, I really have to go to the toilet super often, I sometimes have a craving binge (like "I want you there", I have a few more pimples, I feel dizzy and very tired.
So there are quite a few symptoms of possibly being pregnant.
I've already used 4 tests, and they're all negative.

So today I called the GP, and they told me that tests nowadays are quite reliable.. and that I should wait another week!
Has anyone else experienced this? And when is the best time to test again?

(I'm otherwise completely healthy and have never had a late period before)
I'm also dreading testing again, so scared of a negative result.
I'd love to hear from you..

Best, Poppie