Pregnant? Cramp/Spotting/No period

Soo my so and I have sex about twice a week. My period cycle is pretty regular. I went out Saturday PM 5/22 with a friend and while I was out I had a sharp pain like cramp then a couple hours later went to the bathroom and it looked like my period had started. Pretty light but enough to where I needed to toss out the panties. I wasn’t scheduled to start until Tuesday 5/25 but I just assumed it was early nbd. However, I never bled again. Not anymore that night, Sunday, Monday, Tuesday, Wednesday and here we are Thursday 5/27 with nothing. I took a test on Tuesday (I know too soon) and it was negative. I feel normal, the only off thing is that after my workout last night I went to the grocery store and almost fainted on the aisle..which is very abnormal...I just felt super light headed and I did not have an intense workout. It was actually shorter than normal. pregnant or something else? I’ll go to the doctor soon I was just curious on your thoughts!