Worry

Elizabeth • Hi im new to this app but I have two boys and last September I had a horrible miscarriage. Im trying to convince for about a year now. My boyfriend smokes alot so I`m not sure if it`s him.
Hi. Well its been a full week since I haven't gotten my period. My last period was January 25-30. Im a little bit worry because I did two pregnancy test and they both came out negative. I will be going to the doctor in three days so it can be full ten days. My question is if I am pregnant why don't the pregnancy test come out positive?