Implantation?

This would be my first pregnancy. It sure what I’m looking for and I’m going done the googling rabbit hole. I’m 17 days DPO which I’ve gather as (days post ovulation?) going into my 4 late period day and this started happening this afternoon. Three different bathroom times. We haven’t been actively trying to get pregnant yet but my husband ended up finishing 2 days prior to when this app said I was ovulating. Is this implantation? And can I take a pregnancy test and get an accurate result while this is happening?