Ok so i used a dollar store test the other day. And it had a shadow in the window where the positive is supposed to be but when my doctor did the blood test it came back negative. Idk wat to think. I have had 8 children and i know the signs and symptoms of pregnancy and i have quite a few of them. My last period was extremely light and alot shorter than usual. Does anyone have any advice? My Lmp was february 14th and lie i said it was lighter and shorter than normal.