Hi, thanks for using HCM.. I understand your concern.. Since you had 2 solid lines it means u r pregnant.. Its not necessary that all people should get implantation bleed. Short, quick pain in the lower abdomen 2 weeks ago can be due to ovulation. Around day 14 follicular rupture occurs, hence ovulation occurs.. May be it was just a gas trouble also.. If you dont have any bleeding or pain now , u need not worry. Take folic acid. Consult your doc for blood tests and scan to see for fetal well being.. Hope i have answered your queries.. good day.