Ben-wa/geisha balls!

Sophie • 27 * TTC 16 months * 5 weeks Pregnant!
I have recently bought a pair of Ben wa balls to help with pelvic floor exercises but they seem to be staying in by themselves, does that mean they're working or not? Should I be clenching to keep them in or should I just use them to help with normal pelic floor exercises?
Does anyone have any tips to help to use them?

Vote below to see results!