I do not what oyu had was implantation bleeding, because that spotting would have taken place before your HPT test shows positive I think.
But any bleeding after you are in fact pregnant, could be due to many things....
When I first got pregnant back in 2006, we were very lucky and got pregnant right away. I took a test and we were thrilled. Three day later I had a little bleeding/spotting. I went to the doctor and at that point I would have been in 5th week, but she couldn't see anything. Bloodwork numbers didn't climb appropriately and two days later I basically had my period and was no longer pregnant. My doctor told me that many women think they are a few days late and never even know that they were infact pregnant.... I ovulated normally a few weeks later and about 6 weeks after the original positive HPT, I had another one....and this time it resulted in my DD :)
I have no idea what your bleeding is due to, but if you have any bleeding you should go to doctor.
SoCalTricia is absolutely correct - the embryo needs to implant before HCG can be produced and HCG is what is detected in a HPT.
I believe, technically, that you can't get a positive until the embryo has implanted. So then, if that's the case, you wouldn't get implantation bleeding *after a positive test. I'm not 100% sure about that, but it makes sense.
Either way, if it's just light spotting, it's most likely not a problem. I had spotting a few times during the first couple of months. It was always brownish or pink, never bright red. And it was never a problem. I'm 23 weeks now, and all is well! Good luck!
Tricia
Not all bleeding is implantation bleeding. This typically occurs 7-12 dpo, but it sounds like it might be what you're experiencing. Home pregnancy tests are so sensitive now that they can pick up very low levels of HCG. Also, it may take time for the blood to get out of your body (which is how some women get a positive and then spot).
Unless you've having heavy bleeding that is bright red, with clots, and intense cramping- I wouldn't worry. Just put your feet up and relax!