I am 21 days late on my period which is unlike me.. I always come on between 24 - 28 days of my cycle... I have done 2 tests which were negative, I also have sore breasts but other than that I don't have any symptoms.. I have been pregnant before and didn't start having sickness until found out
Could I be pregnant or am I just worrying

Did you take the tests using first morning urine? If not, you need to. If that still comes out negative it is time to make a doctor's appointment for a blood test and a physical to rule out any other medical conditions.

I would set an appt to get a blood pregnancy test. If it's negative you will probably be given one of two options... either wait until next month and see if you get a period, or your doctor may offer a med like Prometrium which will force a period.