I've googled my life into oblivion my head is so full of useless information. I need to know if anyone on here experienced pregnancy symptoms a week before their period was due before they found out they where pregnant?

My last period was July 17th

I had unprotected sex pretty much everyday after my period ended sometimes without withdraw.

No birth control being used since 2015

Did not take any plan b or anything

Day 21 of my 28 day cycle. Been having random cramps that I sometimes think are Intestinal but feel like menstral Nausea after eating anything barely have the desire to eat. Extreme exhaustion was constipated but I took stuff for that. Alway extremely thirsty for water or anything really. Weird mood swings.

Usually this stuff would happen at the time of my period but it is not my period for another 8 days.