If he used a condom and a lubricant, then it's unlikely that you're PG. Plus the fact that you got AF (I think) means that you're probably NOT pg. In response to your questions:
1-"Can a women still get pregnant even though the guy is using a condom?"
Yes, please read the post entitled "pregnancy info for teens..."
2-"If a guy were to come into a women with his condom on, can she still get pregnant?"
Yes, read the post I suggested.
3-" After having sex, and a woman gets her period a week later, does that mean she's pregnant?"
I really think she isn't PG, but I'd take a test to make sure!
4-"the past 2 days I have been getting somewhat like growing pains in my legs. Is that a sign?"
Hope this helped!