So I had a normal expected period on the 7th-11th december. I had sex on the 12th decemeber where the condom split. I took the morning after pill levonelle on the 13th december. And had another period on the 17th-19th December. For my normal cycle that finished on the 11th December I would usually expect a period on the 4th January. However taking into consideration of the 3 day period after taking the morning after pill I estimated for my period to fall around the 13th january. It's now the 18th and I'm getting a little worried. Is this normal?