They should be taking your blood to check the change in hormone levels. My docs totally had me freaking out watching my blood levels and talking about ectopic pregnancies. I have had bleeding/spotting with my two children and this pregnancy. I had implantation bleeding around the same time as you. I had similar bleeding with a miscarriage many years ago, too. I don't say this to scare you, but to prepare you. Just try to relax. There is nothing you can do to change what is in motion. I know you must be feeling stressed about this, but do what you can to stay calm. My doctors didn't know what to say to keep me calm- had me going in for multiple blood tests (every other day for three weeks) and ultrasounds (I had one per week from weeks 6-8). I'm 26 weeks now and baby is kicking. Take care, sweetheart.
Some women spot the whole time and others don't spot at all. If your bhcg level is good then i would say you are PREGO :-) if you have cramping with red or pink spotting call your doc. Good luck! :-)