Good day

I was suppose to have my periods a few days before I had uprotected intercourse, a week after I had intercourse I got my periods but it only lasted for 2 and a hald days? I'm always tired I urinate more frequenatly then I did before? A week after that I took a pregancy test which showed negative, could still be possible that I am pregnant/

You had a period (even if it was short).. so its unlikely...

And just an FYI..,. the only pregnancy symptoms that are real the first 3 or 4 moths... are missed periods.

It is possible, you can not test so soon, you need to wait till the next period is due and see if you have or miss it.