Hands do not transmit STDs, even if fluids are involved. There's too much exposure to air involved, too much movement, etc.
The toys - that's a theoretical risk, and depends on how you use them. If they were inside her, and then immediately went inside you somehow, then it's possible. It's a bit of a stretch, but it's possible.
It's harder to detect trich in men then women, so if it's concerning to you, perhaps your doctor would just treat you for it. Did your partner test as well as get treated?