Anyone experienced implantation bleeding?

Hey... so for the past 6 months my periods have been clock work, I always come on the 8th 9th every month it being a complete 28 day cycle.

Last night after we had sex I noticed I was bleeding but only slightly, an today I’m bleeding again but it more red although not they heavy. Yesterday made it 4 days before my period. And we did have sex over my ovulation period which was 10/11 days ago.

It’s rare I come on early so I’m confused weather it be period or spotting... also last May I had a miscarriage which was this rare thing called blighted ovum and December 2017 I also experienced a miscarriage.

So I’m basically wondering could I have just came on early... could it be spotting/implantation bleeding or could o be experiencing a very early miscarriage?

Obviously I know no one can officially answer this but i’d love to know other people experiences, 1st before doctors

Thank you xoxo