Help!!

Help! I am 7dpo and bled bright red today with tiny clots then it turned brown and went away. Well I was so discouraged that I decided to get 2 margaritas at the Mexican restaurant an hour ago. I got home and figured I’d take a test just to get it over with and face the fact that I’m out this month but I got this. I feel so guilty. Is this positive for sure? Why would I bleed like that? I’m a well away from my period.