I need to know if i am pregnant?

Hi i had my period on May 11th and been having uprotected with my husband for months and months and years ...Anyways this sunday the 30th of may i lterally had this taste in my mouth that was like steel or something i felt nausiated all day ...Certain smells were bothering me....i mean everything was bothering me i was gaging all day ...my are painfull on and off ...i feel nausious..ever since sunday ..I couldnt wait so i ttok a HPT and it was negative ...is it too early to tell ...around the 23rd of the month i had a severe back aches like around perios time BUT there wasnt no period ...what does someone make of all this ...Or is it all in mind..