So I've had all of my usual signs of period right on time where I should be getting my period, the sore breasts, irritability, hungry, ultra sensitive and emotional, cramping etc,, but I'm two days late on my period. I've had a missed period before but I also wasn't having unprotected sex everyday for two months. We use the withdrawal method and we're always super careful and again, I've had all of the period symptoms, but no period. Not even spotting! Is this normal to sometimes miss a period?