Possibly pregnant or no?

So my last AF was in July. Which was July 24. I never had AF for august. Saturday night I tested with a digital and it said not pregnant. Sunday afternoon I had sudden uncomfortable pressure on the left side of my pelvis. Wasn’t painful and lasted bout 1 minute. I never felt anything after that and few days later still haven’t. I tested I think Monday? And it was negative on a digital.

Ive been feeling extremely tired. Nauseous feeling the Urge to vomit, bad headaches and little to no cramping in the lower part of my stomach. I used two diff apps to see and one just says I’m 13 days late and one says to take a test but I took one few days ago which was negative.

Would I have gotten a positive test by then or did I test too early? When I got preg the first time round. I think I was 4-5 weeks pregnant before anything would pick up I Think! I honestly can’t remember.