I have had a 2 day period, right on time, but strange symptoms before this, like headaches, nausea and fatigue- did 2 tests and they were negative. Is it possible to be pregnant and still have a period?

These are all symptoms that go along with your period as well as with pregnancy. Some bleeding in pregnancy is common, but if it is about the same amount as with a period, I would say that's what it is . If you are still unsure in a week, take another test. I normally suggest that people wait a week after a missed period so the hormones have time to build up.