Pregnant or nah?

Hi ladies
Just wanting some advice
I've been dealing with a faint headache about three weeks, super hungry, nausea, and really really tired for weeks now... though I sleep at least 8 hours a night.
I'm on the pill but last month I skipped as two weeks before I was due for white tabs I has some breakthrough bleeding which I haven't had in years and it was brown and gross... so this cycle I took the white pills but my period was SO light. I'm talking I put in a tampon in the morn, changed around lunch time and it was barely full and then again before bed, same deal and it was like this for only about three days....
I've had weird cramping here and there like painful pops and feels like under my belly button is 'stretching' in a sense.
I've taken two tests, both negative.
Should I be scheduling a blood test? We have a frequent sex life and pill is only protection so I could be... but the neg tests are throwing me off.
Anyone had this experience?
Thanks lovelies xx