<human>: Give me the gist of the text in a nutshell

My cat has been having her "heat" (don't know how to call that really...) for a year in fall and she has had a litter of kittens (2 kittens) early on in her first year. She wasn't in heat for 5 weeks and then was in heat for a week, then stopped for a week and a half then started again for an other week then stopped for a week and now has started being in heat again and has been for two days. I was wondering if it was normal or if I should take her to see a vet.
<bot>: My cat has been in heat on and off for 4 weekish now and I think it isn't normal but am not sure.*