I was supposed to start my period on the 26th of December- tomorrow. However, on the 20th or so I began experiencing some light cramping, which has never happened the week before my period before. On the 21st, I began experiencing light spotting which occurred on and off until the 23rd. Again, I have never had this before in my cycle. Neither of these things is normal for me. Then, on the 23rd I began actual bleeding which seemed like my period. It only lasted for about 48 hours, and has now stopped. I've never had this happen before, so I am wondering if any of you ladies have experienced something similar, and possibly have advice on what it could mean. My cycle is usually extremely regular, lasting for 4 days and coming exactly on time. 

Thanks so much!!