Am I pregnant or???

My period is 10 days late. I went to the ER Saturday and the found 8mil of HCG in my blood after the urine test came back negative as well. On July 25th I had a watery brown discharge that’s never happened before. I took 4 pregnancy test at home prior to going and they were all negative. I have a follow up with OB Wednesday to see if my numbers are going up or going down. Praying that they tested super early and that’s why it’s so low. Idk what to think😖