so scared!

Long distance relationships suck, but the good thing is when you finally get to hold them again! We don't wear a condom but I am on the pill. Haven't missed one. But my period hasn't came and I'm PRAYING that it's just Mother Nature scaring me! I was cramping, but not an actual period. I told him it came but it hasn't. I was just getting off my last period last time I saw him. I know it's not common, but still possible. What to do?