L.B.
Tubals show up around 7-8 weeks. I think if it were tubal, you'd still test positive. But tests can run negative for some time, especially if you drink a lot of fluids every day (while a healthy habit, the extra water dilutes the hormone so it might not show up on the stick).
When did you take the pregnancy tests? Even though they say you can get accurate results at 2 weeks, it's still very hit-or-miss. Try another one, first thing in the morning.
Regardless of your insurance situation, if it's tubal, you need to get medical care immediately, as it ectopic pregnancies are life-threatening.
Some pelvic pain can be normal in any pregnancy, as you might remember with your pregnancy with your first son. It's the uterus "figuring things out." Not every woman experiences it, or much of it. I sure did.
But get it checked out. There's too much at risk for you not to.
L.