Can someone tell me if i may be preggers?

I've been trying for a while now but aunt flo comes like clock work every month, except this month. I been having what feels like menstrual cramps for about a week now but no period. Everytime i feel it it's like oh yea i know it's coming now, but nothing. I haven't taken a test yet, in fear that aunt flo will come or its too soon. I'm like 3days behind on aunt flo and don't get me started on these ............. what do you think.