Pregnant?

My period is three days late I have little cramps but not like period cramps they are these light cramps like on one side it’s weird I took a Tylenol & it went away but my boobs are kinda sore I took a test today a cheap $1 tests you buy at the dollar store and it came out negative what should I do? My boyfriend & I have unprotected sex all the time without withdrawal we’ve been trying but nothing