Welcome to HCM,
According to you bleeding occurred on 8th, and brown staining on 9th and 10th of April, while your first OPK test was positive on 6th April. Implantation
bleeding occurs generally a week after ovulation (about a week before next expected date for menstrual period). Therefore chances of implantation are less. During periods bleeding is usually heavy, while it is scanty, almost spotting in case of implantation. Blood discharge during period is bright red containing lot of clots, while discharge during implantation is pinkish or brownish in colour. In your case, on first day there was discharge of blood, which indicates that it can be due to period also. Please get your pregnancy
tested & consult a Gynaecologist.
Wish you good health & early conception,