For some reason i can get a bugshroom worm without using a bugshroom. This happened by already being affected by a parasite worm.
Apparently when you already have a parasite it will trigger either the bugshroom event or the parasite worm event when sleeping.
I was confused because i thought you were supposed to be affected with a bugshroom in order to get the H events of it. Apparently not.
And yes, i was only going for the parasite worms because i wanted to see if it got fixed with multiplying when the event triggered, but instead of giving me the parasite worm event it gave me the bugshroom event and increased the parasite count for bugshroom.