Implantation bleed 2 days before Af?

I’m not 100% sure when I ovulated as I don’t use OPKs but according to the app it was 23rd of June. Af due in 2 days time but had tender breasts for around 9 days now! I’ve had negative tests so far. Me and my partner had sex last night and when I went to the loo afterwards there was some spotting on the toilet paper. Never had anything like it before period or after sex. Could it possibly be implantation bleed? Already have a 2 year old and I’ve suffered to early miscarriages in the last 6 months. Hoping this is a good sign but won’t get my hopes up!!