Help!!! I need advice.

Jasleen
My fiancé (24) and I (20) have been ttc for 7 months now. I took a test yesterday and left it at home (busy day) and when I looked at it last night it was positive, then I took another one this morning and it says negative. I'm a week late on my period, and have symptoms (tender boobs, cramps, acne, morning sickness). What do I do? I bought a cheap test from family dollar, so should I buy a different brand and test again? Go to the doctor?