Every time Marinette and Adrien want to concieve they have a hard time finding days where neither is busy with work and also coincides with Mari ovulating, so whenever they do they stay up all night making love non stop because they don't want to miss the little free time they have together. Mari wakes up with wobbly legs and weak hips and Adrien apologizes but she doesnt mind because she'll have Adrien's baby and they are just so in love it's beautiful <3