I'd be questioning this and asking them to check your P4 levels and continue the pessaries for at least another 4 weeks. If it wasn't a natural FET then it will take a while until progesterone is being produced by the forming placenta (normally your corpus luteum from a burst ovarian follicles will do that in a natural FET - ie when you ovulate). I took support until about 12 weeks but some clinics wean a little earlier than that.

A huge congrats to you too!!!