Implantation? Pelvic ache/dull pain

Ru

I am exactly 7 DPO and my period is suppose to start in 5 days. However in the last couple of days I’ve had an ache to my right side pelvic area. More like a soreness. It’s not painful , I’m just aware and can feel it. I’ve never had this happen before. My husband and I have been TTC for 7 months now, can this be implantation?