Implantation or super early period ??!!

So I had a late miscarriage in sept. Got my first period about 6 weeks after. Have had a normal 28-32 day cycle every month since. I did opks this month and here’s my chart. We had sex that Sunday, Monday, Tuesday and Wednesday. So we covered the bases. Fast forward to today. Only like 18 days after my last period. 7 dpo. Period is due in 11-12 days. And I’ve been lightly cramping and just started light bleeding red. Think it’s just super early period or possibly implantation ? I didn’t have implantation for my last two pregnancies. Just sad and confused right now. Please comment your thoughts and experiences!