Do symptoms mean I'm necessarily pregnant?

one months ago while I was on my period I had unprotected sex, well not really, the guy just putted his pen*s on me.. but in less than 2 minutes I pulled him out of me.... now... a month later I had my normal period right on time... three days after my period I took a pregnancy test and it was negative...now I am feeling kind of weird.. with pregnancy sympstoms can I be pregnant??

Anything is possible, and home pregnancy tests can be tricky.
One thing is for sure.. Because you may just be having nervousness and be stressed, which could also cause symptoms like nausea, cramps, sickness, weight gain, cravings, moodiness, irritability, things like that..
My suggestion, is to consult a doctor, and have a medical professional give you a pregnancy test.

You can never know if you are pregnant or not just by symptoms. The symptoms of early pregnancy are the same as symptoms of dozens of other things.