Here is the Federal Misprision of Felony
charge. It is a felony offense, which need not require a jail sentence
but which carries a maximum penalty of three years in prison. Unfortunately, even were they to come off of this charge and offer you some kind of a misdemeanor option, there is no such thing as an expungement
of a Federal conviction, unless it's a first drug offense and you're under 18. The only way to mitigate the effects of a Federal conviction would be to apply for a pardon from the President of the US and have it granted.
You are not required to take any plea agreement, of course. If your husband's confession that implicated you is a falsehood, you can certainly choose to go to trial
on the case. Your maximum risk would be 3 years. You will need a Federal criminal
lawyer, and a good one. The conviction rate for Federal prosecution is 98%. They can lose cases, but they are known for their thorough investigations
. They do not file charges until they believe that they have in hand the evidence needed to win.
Sorry to be the bearer of bad news