Girls only! Period problems...?

I'm 14 and I started with a heavy flow as quite a few of my friends did. My dad is a surgeon and I asked him about if it was "OK" (I only live with my dad) and he told me that a heavy flow is ok the body is just doing the natural thing in regards to ovulation, My flow has calmed a little now but I do still have some months when I have a lot of leakages, I try to change my tampon ever 3 hours when I have a heavy flow and I also get sever cramps so my dad (he knows due to my bad mood the week before that I am due) and will give me a box of ibuprofen to ease the cramps. Everyone id different however if you have a heavy flow for more than 2 weeks then there is cause for concern and its important to see your doctor, don't worry though they have heard it all before :D x