Implantation bleeding or?

Soo I had unprotected sex on ovulation day, on the 7th in the morning I had some blood when I wiped nothing after, the night before I did have bad lower left back cramps and lower pelvic cramps and on the 8th in the morning same thing followed, even with the cramps the night before. Im not due for my period for another 3 days so I’m not even sure if it’s worth it to test... what do you ladies think?