could I be pregnant?

I'm going on my 10th day past my period. I had to stay home from work today because I'm so nauseous and my cramps are awful. I went to my family doctor months ago because I thought I may be pregnant then too -came out negative- but she was feeling around my stomach for something hard she said. And I don't know when I would start to get that. I felt around my stomach today and it was pretty hard to me near my pelvic region. Also I took 2 tests one on the 3rd and 4th day I missed my period. It was first response brand. I'm 19 and currently not attending school and I'll be off of my moms insurance at the end of the year because of it and my doctor is super expensive. I don't have the money to go see her. Not sure if I should just go to the doctor or take some more home tests. I'm really nervous and I do t want to have a baby right now.. does anybody have any ideas what I should do right now?