No it shouldn't be taken as a sign, but if you're not wanting children then you shouldn't be taking the gamble because it will happen. If you're really concerned you could see a doctor, but until you're attempting to conceive there's not much that will or can be done. I'd figure out your options and get on birth control as soon as possible.
Hi - well you wont know until you really try to have a child... I would go to the Dr to get checked out and if all is fine on your side it could be that your BF might not be able to have children!
Good Luck