It took a moment for her words to form into coherency in his mind. With... child? Of course, it was possible; their species were cross-fertile. It just... hadn't occured to him as an opton. Not him and Mary Shelley.
His eyes widened. "Oh, good Lord," he murmured. "You can't be, not now. It's not supposed to happen now." He wasn't even concerned with it being with him, not at the moment. Mary Shelly couldn't be pregnant at this point in her life.