Irregular Peripd

So I rarely get my period. My sister is the same way. Just recently I had my period and it was super heavy and only lasted maybe 2 days. I only get them like every 3 months. This has been going on for a few years and I didn't think much because some people said it was normal but it's getting a little out of hand. Does this happen with anyone else? I should be planning a trip to the Doctor soon.