2 weeks late.. one faint line positive??

So me and my partner have been trying for a few months, my last period started 18th March.

I’m now 2weeks late following this app or 9 days late with another.

Took this cheap test last week and I think I looks like a faint positive??

Took 3x clear blue test since, last one this morning and all negative!!

I am feeling sick a lot and having cramps/back ache and extremely tired!

What shall I do? Wait and take another test in a few days? Go to my doctor? Help!?? Need advise.