Pregnancy Info HOME

Hi everyone, I need some advice. My lmp was 8/21, so i was due for af around 9/22 and it never came. I only had sex once since my lmp-on 9/27 (sunday). The next monday 10/5 i started spotting dark brown. Not a lot, barely enough for a panty liner but it did last almost 7 days. I took a hpt 10/9 and 10/10 which came up bfn. I also had a blood test done 10/8 that came up bfn also, value said [2. I still haven't gotten my period and was wondering is there any way I'm pregnant? I was thinking maybe I ovulated later than usual which would have been right around the time we had sex. I am bloated and thirsty all the time, go to the bathroom what seems every hour. No sore boobs or anything. Has anyone experienced anything like this? I'm so confused...