Yes. Once you have money in an HSA, you can use it to pay for medical expenses for yourself, your spouse, and your dependents, regardless of any other medical coverage.
However, because the FSA can also be used to pay for medical expenses for the owner, a spouse, and dependents, your husband's FSA counts as "other medical Insurance" for you and disqualifies you from making contributions to your HSA.
If you made disallowed contributions, you need to remove them from your HSA, or pay income tax plus a 20% penalty.
