Implantation cramping??


My husband and I are TTC and we put in a pretty solid effort this month (lol). I got positive OPK on CD 15 and On cycle day 26 I experienced some pretty severe twinges on my left side of abdomen (felt like uterine or ovarian pain) the twinges were about 30 seconds apart and lasted for about an hour. I still feel a dull sensation there now I think. I am hoping this was implantation but took a cheapie pregnancy test today ( CD 27) and got BFN :-( has anyone ever experienced something similar and been pregnant??