I was taking birth control but I stopped on January 2nd.. had unprotected sex on January 7th and my ovulation day was January 9th. What are the chances that I could be pregnant?

How do you know your ovulation was on the 9th ?
Not by using a silly online calculator ?
You would have to had tracked it using body temp and watching for slight changes to know true ovulation.

But with that said, there are no odds, some people do it exactly on right time for 12 months and do not get pregnant, others get pregnant first time they have sex.

So you just have to wait to see if you miss a period.