As i trimmed? I noticed one seed fall out. What do...

Hey ghost. If you are sure there was no other way that pollen got into the room like bag weed or anything them yes she self pollinated. This can be from stress but since you got tue seed from a friend it probably came out of a bag of seeded bud which mean the mother was most likely hermie because I doubt the grower seeded them intentionally. This is why it is important to get your beans from a reputable breeder. Most seeds that come in buds you get are going to be hermies.