Thanks for writing in.
When a female is pregnant, it is unlikely that she gets stabbing kind of pain in lower back. You can get feeling of breast tenderness, fullness in lower abdomen, nausea
, when you get pregnant.
You can do urine pregnancy
test which comes positive 14 days after implantation
has occurred in uterus
. It is more likely that your periods are going to start.
I hope I have answered your query. Revert back freely, in case you need clarification.