I am a 'bleeder' too! There is quite alot of info here and some of it is a bit graphic so please bear with me! If you don't have time to read it or are squeemish, then I would suggest going to the docs for peace of mind if nothing else.
I suffered as a teenager with heavy periods which were really painful and very miserable. By the time I got to Uni I would be constantly changing my bed sheets through my period and during the heaviest three days of my period would visit the loo hourly, armed with tampax and nappy sized pads. Finally I was prescribed brilliant painkillers and drugs to slow my bleeding, but the octor didn't think there was anything really wrong. Oh and I used to sometimes bleed whilst performing 'bedroom gymnastics' !
I had a small artery in my throat burst a week after I had my tonsils removed, aged 17 and used to joke about making a bit more mess than everone else if I cut myself. I also bruise quite easily (might not sound relevant, but apparently is!).
After a MMC and 2 D&Cs a while ago, I had a Mirena coil fitted which was the best thing ever. My periods were minimal and I had very little period pain - would definately recommend if after investagation they find everything is ok and that you have just developed heavy periods.
Then 2 years ago I lost a baby mid-term due to a nasty genetic disorder. Without wanting to upset anyone, obviously this meant going through labour which was terrible. Then to make matters worse (if that is possible) the placenta wouldn't pass and so I haemhorraged. They had given me lunch whilst we waited for things to happen and so then couldn't give me an anaesthetic to sort me out - although about 5 or 6 hours of bleeding later they decided that the bleeding had to be stopped so I was whizzed off to theatre. None of the doctors at this time suggested any follow up.
I now feel like the luckiest person alive and have a beautiful 7 month DS who didn't arrive easily! After being induced and contracting for 6 days he was born by emergency C-section. The following day My surgeon came to see me and said she had never seen anything like it in over 400 c-sections, so refered me to the haemotology department. 7 months on I am now making monthly trips to a specialist haemophillia centre, whilst they try to work out what is wrong with my blood and why it won't clot properly, they think it may be a 'storage pool' disorder. They need to work out what it is and why it is as my DS is soon to be operated on at GOSH and they need to know if he could be affected too.
I sincerely hope you are just having a bit of a blip, but get to the doctors and get checked out. If it persists your G.P may prescribe you 'anti-flood' tablets (as I call them) and if you are not trying for a baby, maybe ask for informaation about a Mirena coil. My specialist says my 'history' is hugely significant and that I should have been refered at the point where I just had heavy periods. My specialist is a man and its awful having to chat to him about tampax and blood trickling down the back of my knee, but they are there to help you! Good luck, I hope you get it sorted.