Help?

So I had an extremely abnormal period this week, if we can call it a period. It was heavy enough to fill 3 regular tampons with no leakage in a span of three days while my normal period is at least 5 days of HEAVY bleeding. Now that’s it’s passed, my back and legs are so achy and my liver abdominal region is mildly crappy/tight. Is this a sign of pregnancy? I didn’t have sex, but I was fingered and dry humped- precum was present possibly but never was noticeably around me, and underwear was on during dry hump. Took a cheap pregnancy test and came out negative, but now I feel like I’m doubting it.