keep them going and candle them at day 5 you might be able to see something by then. even if you don't it doesn't mean they're not growing. it depends how long they were colder. but too hot is worse than too cold.
From someone who did the whole adjust the distance to get the right temp thing.....
It can be done.... but you won't sleep for a VERY long time.
I highly recommend you get something that will keep a steady temp. or at the very least set up with a dimmer switch so that you aren't constantly...