Me and my partner had both got cured for chlamydia, took medicine on the 20 and had sex on the 26 are we fine? we didnt realize we were on the 7 day and not after what are the chances of us being reinfected and of course we will get retested?

No problem and no risk, especially if you both were treated with doxycycline. If not (e.g. if either of you was treated with azithromycin), you could both be retested in a few weeks to recheck. But do not retest sooner than 3 weeks; it sometimes takes that long for the test to become negative, even in persons who have been cured.

There is a very good chance you will be OK but cant say for 100%.