What kind of transmigration is this?!

Exhausted and demotivated from the everyday struggles of life, she fell asleep and woke up to become some random side character on a novel she just read before sleeping! She became one of the short flings of one of the male leads in a reverse harem novel. After running away from the male lead's bed. She found out after 2 months that she was pregnant! "...." what kind of transmigration is this?!