Am I pregnant???

My AF is due in 4 days, but I had light spotting on the 15th. I had sex on the 6th, and since the spotting I’ve been having small cramping feelings (not like PMS), soreish boobs (never get sore boobs with PMS), I’ve been really moody and emotional lately (I cried over an egg roll because it stank but I wanted to eat it), I have been really bloated (this is normal for me around PMS, so kinda confusing). I’ve taken a test that lets you know 6 days before a missed period this morning and it was negative— what are the chances that I am pregnant but the hCG is still low?