Possibly preggo?

My periods just got back to "normal" in the last 6 months. I was any where from 28-31 days. Well, I am currently 5 days late.

I have been randomly nauseous. I get the mild cramping. No sign of my period at all. Today I was extremely tired and just felt run down. I do have that gut feeling I may be pregnant. I did test this morning and it was negative.

My mother in law saw me on Sunday and asked why I was glowing. I told her it was because I had a neon orange shirt on....she asked if I was sure. So now I'm even more nervous. I didn't find out till I was over 2 months pregnant with my first.

When should I test again? I'm supposed to go to a bachlorette party on Saturday I was thinking of testing the morning of. I'm just worried that if I am and I get a negative it could harm something.