Late?

Logan
I'll start off by saying this, I'm in a LDR and I got back from visiting my boyfriend for a month and a half on Sept 29 and my period came the day after I got home. It was slightly lighter than normal but still lasted the 5 days that it usually does for me. And now I'm on day 13 of this month's being late. I've had cramping on and off for a week, no spotting, and have been a lot more emotional lately than I usual am... it's all making me wonder more if what I thought was my period last month wasn't?