Yes it is possible to get longer and heavier period after 6 months of not having them though 2 weeks is on the longer side. You did not state your age as the diagnosis and management varies with that. Since this post is 5 days old maybe things have subsided on their own by now or worsened enough for you to have seen a doctor.. If not then you should rule out a possibility of abortion by getting a Serum beta HCG done which will be positive if you got pregnant and later aborted. An ultrasound might just also help in aiding diagnosis. This is a possibilty if you are sexually active and have irregular periods. Let me know the the current condition and i will guide you from here on.