I had the same problem with my Nepenthes, and according to the people who helped me out, its not bad.

did you check if your Vft had a bug in its trap? ants usually do that when a flytrap digests a big bug for its trap. since the remaining part of a bug would be too big to digest, ants take advantage and infect the container with the bug remainings. everytime this happens, i see no harm to it. ants just like devouring on left overs that venus' flytraps leave behind. you shouldn't worry at all.

ok thanks, just walked outside ans saw ants allover them wanted to make sure it was ok