A childhood belief about periods

When I was younger, I was riding the bus home from school and a girl started talking about periods with another girl and since I didn't know what they were just yet, I asked where the blood came out and I thought she said "your titties". For a while, I was so scared that it was going to come out of my breasts and everybody would see the stains on my shirt! About a year later, we were going to have to watch a puberty video at school. My mom was talking to me about it and she kept talking about the process going on in the stomach. So I asked "does the blood go up a tube to your boobs or something?" You can guess that she gave me quite a strange look and said "what are you talking about?" And I told her what I heard and she just laughed at me and explained menstration the proper way. Needless to say, I was a bit embarrassed about the whole situation...