Well, I had this happen too. I was sitting on my bed, and there was a sort of whoosh. I bled all over my pad and then on the bed too. It made me feel dizzy, and freaked me out, lol. It slowed down almost right away, so was okay. I have been told by my midwives that at 2 weeks or so, the *scab* for the placental site falls off, and I have always had a recurrance of heavy bleeding at this time. This time it was around 3 weeks. I have also been told that there are *pockets* of the lining that continue to contract with nursing, and sometimes a gush or two will come out.
Of course, the most likely thing that happens at around 2 weeks is that you stop taking it so easy! You probably feel better, baby is settling in, and the visitors have stopped bringing food. You start with more housework, you drive, you go to the store and bend and carry more. So, your bleeding increases, sometimes all at once.
Personally, after five babies/two miscarriages, I am a firm believer in lying down to rest as much as possible in the first month. The two babies I have been *able* to do this with, I have recovered the best, with little/no postpartum depression/anxiety. Also, less bleeding overall. I know that it is not always possible, of course, but I tried my very best, and it seemed to help.
I would call your midwife/doctor if this happens a lot, but an isolated incident is probably fine, if it slows down.
Congrats on your baby!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Try to rest, and just cuddle that baby. I like to really drink them in, and nuzzle, lol.