Please help, really important. Missed period, l pain.?

From what you were explaining, you could be pregnant. Even though a home pregnancy test is saying negative, doesn't mean that it is accurate. I had a very close friend that didn't know she was pregnant and she had drank several times early on in her pregnancy. Also, all of your symptoms could be due to stress, but just to be on the safe side, you should go to the doctor just to make sure. Good Luck!!!