Scared symptoms there but tests are negative?

My period is over two months late now and I am having the basic pregnancy symptoms: weight gain, increased discharge, constipation, exhaustion, and muscle pains. However I have taken 6 tests (2 at 1 month late, 1 a week later, and the others at different times after the 2nd month late) and they are all negative. Wouldn't that mean that I'm not pregnant? I am on the pill and use condoms. The pill I'm on is loestrin fe 24, my boyfriends boss told me that the same pill caused her period to cease for over a year. My cycle became very irregular and then stopped along with the symptoms coming. Should I still worry about pregnancy?