I had sex the day before my period ended. I have wierd pregnancy symptoms: Back pains, sharp abdominal pains, cramping, migraines, frequent peeing, excessice eating moodiness. brownish discharge also clear discharge. I just took a hpt and it came back negative.

Could I still be pregnant
Also, I think i may have waited too long after opening the pouch to take the test oops! I also kept it in the urine 2 seconds too long. This is my first time ever taking a pregnancy test. what should i do?