From personal experience, yes small toys can get temporarily stuck in the vaginal canal. However, they do come out with patience and a bit of coaxing. The vagina has a small area, and a hard stop at the cervix, so unless the toy is truly stuck, it's not really going anywhere. It's certainly not likely to go, say into the uterus. Just no way for it to easily get there. However, the lower intestine is a lot longer and doesn't have its own backstop, as it were.

I did "lose" a bullet once -- maybe 2 inches long, and slimmer than a standard dildo -- but even though it was too slippery to grab hold of with my fingers, it slid out on its own a bit later.

All my good anal tips have already been covered, so ....... good luck!