I am 29 yrs old and have a two yr old son. my husband and I have been actively ttc i ovulated on the 17th cycle day and had by period on the 27th cycle day. I cramped two weeks prior to my period starting. my period lasted for 4 days like usual. but 2-3 days after my period i have cramping and sharp pain in my lower left pelvic area, today it is also around my back a little. i have an app with my obgyn on wensday. but what could be wrong? i have taken pregnancy test but its neg.