How messed up is my oven, rained 10 hours after mortar?

So my plan was to build up the oven and then cover it so if it rained it would stay dry but I forgot to cover it and it rained the next day. So, I only finished about 3/4 of the firebricks and then it got rained on for two days only after about 10 hours of drying. Am I screwed, what kind of damage did this do?

You should be okay -

The mortar is still wet… the firebricks that you soaked in water are still very wet… It’s very doubtful that the rain penetrated the mortar to a point of effecting the bond. Give it a couple of days to dry and LIGHTLY tug on a few of the firebrick. If they don’t pop right-off, you’re a-okay!