First off, I am not positive that I am pregnant. I took a test and it said positive but I waited a few days and took another one that said negative. Anyways, I had my period on july 10th- 16th. Then on july 23rd I started spotting off and on light pink and brown discharge. It has been happening for about 5 days. Then it stopped for a day. Now I am bleeding bright red with a few clots here and there. I was just dont know if it is implantment bleeding or a miscarriage. My sister has had one before and said sounds like I am miscarrying. Can anyone give me some advice and their opinion on if they think I am or not?