12 days late... Am I pregnant??

I was suppose to start my period September 20th..never did.

I waited a few days just maybe thought since it was changing seasons the weather could be a factor (co worker told me this)

Yes my partner and I had unprotective sex in August but I had a period I'm august from 20th till 24th.

So its october 2nd now and I still have yet to start.

No cramps like normal pms before period

My boobs are enormous and soo sore and heavy feeling.

I had a little discharge last week for maybe two days it was mostly clear/white but lasted only 2 days and not alot.

I took two pregnancy test on 29th of september both were negative....

What is going on..