When did your cycle become regular?

I’m almost 9 months pp EBF (he’s on solids too so it’s definitely not as much) and have had my period since 6 months pp. They were regular periods, I would say the same prebaby but my cycle was 35 days long when it’s usually 27. I wasn’t suppose to start my period for another 2 weeks but got it on Saturday. It’s been very heavy, with tons of clots in it and so painful which is all so unusual but it came at 27 days. Should I expect this to be my new normal period or could it be something else and reach out to my OB?