Negative or positive???

So my boyfriend and I have turned our eating habits a full 360! More fruits, veggies, no red meat and low starch for me. It has helped our weight lose goals tremendously! Going back to February, my cycle was a bit...different. It was primarily brown and pink with moist discharge and it lasted a day and a half conpared to the normal 3-4 days. Fast forward to March, and no sign of a period. I am now officially 10 days late. I took a CVS pregnancy test and it gave me a HORRIBLE read Friday morning which I'm sure it was a false positive because I took an ClearBlue Saturday morning and it read negative. I threw up slightly earlier in my school parking lot, have been very nauseous, dizzy, fatigued, and have been experiencing back ache and stomach cramps. Could this be pregnancy? Did I take the test too early? Should I take another one? Please tell me this happened to someone else!

Signed,

Dazed & Confused