Hey hey can anyone shine some info

Ge

Normal cycle is 30 days I ovulate on CD 15, got my opk positive on CD 14 this cycle.

It is CD 23 about 8dpo and I feel very gassy cramps, lower back hurts and bbs hurt on the sides.

Can you implant on 8dpo ?? And what does it feel like?? Cause I feel like I’m gonna start my period right now.