Help i need to know if i am pregnant.?

For the whole week before the 29th and a few days after. I think i ovulated before that tho. So its been almost six days since my supposed ovulation date and for about 5 days i have been having light cramping but it comes and goes. Im not supposed to start until may 13. I do get stinging pain in my but it will happen like once a day. Today i noticed that i had white discharge but it was still kinda runny but it defiantly was white. I have been having a lot of gas also... also today i was in school and i all a sudden got really hungry and i couldnt handle it i had to go out to the car and search for a doller and i got some cheetos plus i was craving mustard pretzels..