Hello,
First off, no worries, you are actually in a really common situation and people file late all the time. There is actually no additional forms that need to be filed (because you are late), but know that if you end up owing US taxes, you could be faced with a late filing fee and interest. Fortunately if you do not owe anything to the US, you do not need to worry about being late as fines and interest are based only on taxes owed.
In addition to the tax forms, you will also have to file an FBAR form (possibly FATCA depending on the balance) if your foreign accounts are over 10K. Although your husband does not have to file a US return (just file as Married filing Separately), you will have to report any joint account balances on your FBAR reports. Thankfully you are not taxed on these amount, they are simply for reporting purposes.
I hope this helps!