I would eat leftovers if its just the next day and it has been in the fridge. I think just have a good look and smell of it to make sure its not a bit funky.

I also ate heaps of ham. Towards end of my pregnancy I had a huge obsession with toasted ham & cheese sandwiches!! So I used to go to the supermarket and get some packet cheese and packet ham and make a sandwich and toast it or microwave it. I always used to get the ham and cheese from the back of the fridge and try to get one with the longest expiry date.. I wouldnt eat deli ham or cheese though.