Please help. Cervix very low

8dpo, I'm still a week away from AF. I've been having really bad period cramps for more than a week now.

I just had a really painful one and felt discharge come out, so checked my cervix just in case there was any blood. It was very very low, and Google says that means AF. How can I get AF twice in one cycle? :( I usually have 30-36 days cycles