Anyone ever let their toddler nap really late/long (like over 3 hours/past 6pm)?

Please comment what the situation was and how it worked out. And also if anyone else has had a shitty parenting day like this to cheer me up.

My 3 year old has been napping since 3pm and it is almost 6. Bedtime on a school night is usually 7:30 but he didn't sleep well all weekend because we were visiting family.

At first I was letting him sleep just because of that and now, I have been sick (pregnant) and exhausted all day, my husband going to a ball game after work and won't be home until late. I kind of just want to let him keep sleeping and see what happens. I know I already should have woken him at 5 so at this point I feel like I am screwed either way.

I don't know. I guess he needs to eat dinner. I am having a really bad day and feel like a crap mum.