Hi J
I'm not sure about contraceptive pills,what i know for sure,
from experience, is that exercise does increase the size.The more
your labia gets sucked on and played with the more it seems to grow.I
have a gf with real small labia and clit ,that has definetly
grown over the last few months just from me sucking and playing. One
can see the change in photos taken then and lately.
Regards