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I'm sorry I don't know what's going on with you. It's definitely not implantation bleeding because implantation should definitely occur in the 2 weeks after ovulation. It is possible to be pregnant and still have bleeding. Can you take a blood test and/or talk to your doctor?
I would also like to point out that ovulation tests don't tell you when you ovulate. They tell you when you are about to ovulate. When you get a positive you usually ovulate within 24-36 hours after the positive. You only ovulate on one day, and you need to get the swimmers in there beforehand so it sounds like your timing was pretty good. Welcome and good luck to you!
Hi Hun, Was AF on the 15th a usual flow or was it light. I've read that bleeding around the time of AF may not actually be AF... If its lighter it could be signs of pregnancy but may not be...( Not trying to get your hopes up) The spotting in between may be due to pregnancy but also could be that this month your body is just doing something different. Factors other than pregnancy could contribute to the spotting... I guess there is no way to know other than leaving it another week and testing.. Ive read many women have what they think are AF's each month but as we can not get a period whilst pregnant as the body can not support a baby and a period at the same time, they presume there having AF during pregnancy. 
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