I know this is a strange question. ive been dealing with anxiety, but have a scenario in my head that is causing anxiety if it could happen. if a condom had been lost inside, how long are sperm able to survive? even if it somehow got twisted shut?

Any sperm in the condom in this situation would die quickly, with little or no pregnancy risk should you ovulate. But you can be pretty sure there's no lost condom: a foreign body in the vagina like a lost condom (or tampon, a lot more common) usually results in bacterial over growth and symptoms of infection, like vaginal discharge with odor. Without those symptoms, a lost condom is unlikely.

Lost- in- vagina condoms will leak and vagina is fertile area for sperms no matter how small the leak. Chances of twisting shut is miniscule. Pl don't worry about hypothetical things make sure partners condom is right size or you take local or systemic precaution of birth control. You will be OK