I just got treated for chlamydia 2 hours ago? I also need to take a Plan B?

You'd need to put the name of your antibiotics into the search field of this website, & check contraindications to see if affects hormonal birth control.
It's unlikely to affect it, but check just in case.
Plan B would not be the best emergency contraception if you were around your ovulation. You'd need one of the other methods of emergency contraception; either the other emergency pill called Ulipristal Acetate or to have an IUD fitted by a doctor. Either of those things can be effective if done within 5 days/120 hours of the unprotected sex.