Period cycle changes after miscarriage?

Did you period cycles change after your miscarriage? I got my period back 4 weeks after my miscarriage and my usual cycles are 5-6 days long but this time it was a full 8 days and now two more days of mild spotting. Ahhh just want to know if this will affect my predicted ovulation date? I am taking my BBT so hopefully this will help me🤞🏼❤️