Very Confused, Help me get an idea if I am pregnant or not?

Ok.. been on here quite a lot lately. Confused by certain signs my body is giving me...and i have no insurance working on it so it is making it harder to figure out. I found out I was offically due for my period at the latest yesterday.I have had very frequent urination ( 7 times one day from 9am- 6pm..and only had one gl of pop)..my are sore and enlarged..but my aren't really tender...i have random twinges in my abdomen from time to time.. i keep thinking i am about to start. took two tests...one nothing showed up..no control line nothing..i looked after the supposed time and there was a faint plus... then took another the next day..negative..and stayed that way..these were the saturday and sunday before period...I went out and got first response early result..and will take one this weekend..Last thing...I am having random nausea fits where i gag or feel like i am going to....I know only test can tell me for sure... but I want to hear what you say..Could I be pregnant