Ovulation after miscarriage

I recently had a miscarriage at 9w5d on 23rd July 2019 and my cycles after having my first child are 25days so on CD 7 on the first cycle after miscarriage I did an opk and came back positive I then waited 3 days and again did another and both said I was in high fertility. Is it just my hormones from my miscarriage that are giving me positive opks?