Hi I have a regular cycle which last 4-5dys and heavy. This month it came a week early and was very very light and lasted 2-3 days. I have also had discharge ever since so about 2 weeks. Did a test and was negative. Now my breast are sore. Could I still be pregnant?

There is always a possibility, but with a negative test and as much discharge as you've had it seems pretty unlikely.

Sometimes our cycles are just "off" for no reason or for other reasons such as medication changes, weight gain/loss, stress, etc. Painful/tender breasts also occur during ovulation and if its been two weeks since your period, that's more likely than pregnancy at this point.

You're best served talking to a physician about this.