Positive 3 days before I am suppose to start period!

I am suppose to start my period tomorrow. However, Friday morning I woke up and didn't have to go to work due to our school being closed because snow.. I took a test just for fun and wahlah...positive. My husband is an engineer on the boats and is away right now (and was asleep at the time) but i had to call and wake him up with exciting news! We have a little girl who is 3 years old and we have been TTC since May..