Someway Somehow

Prompt: River and the Doctor are at some planet and they don't realize it's a fertility festival and River ends up pregnant very quickly going through the stages.

"She wanted to blame him for this. She really wanted to blame him, but logically, she knew it was mostly her own fault. She’d had all the information about this place but she’d been so focused on getting a good shag that she hadn’t pieced it together. “This is not what I signed up for.""