Implantation bleeding pregnancy or consistent wit having the mirena removed?

I've been having pregnancy symptoms since June 13th.. it started just 3 days after i had unprotected sex on the 10th which was the first day of my ovulation period.. my symptoms include very bad mood swings,gassy,eating more, breast tenderness, severe headaches, nausea, backaches,using the bathroom more and cramping.. My period normally starts on the last day of the month.. well what i assume is my period came 2 day. 3 days early.. also i did take 2 pregnancy test which was negative.. but if Im pregnant i would only be 2 weeks and some days so it may be early.. but i wanna know can i have heavy bleeding aka get my period and still be pregnant..