If your residency expires without you reapplying, then it will be expired.
If you enter Japan after this point you will have apply for a visa from outside Japan as a spouse. Probably would involve your husband getting a COE in Japan and then apply at J embassy in your own country. Could take 2-4 months.
Or you to try to enter under visa waiver system and apply for change of status once inside Japan. However, you might get refused entry if you don't have an onward ticket or they suspect you are trying to enter for a purpose other than tourism, a short visit or business (which in fact you are). I would also worry that letting a spouse visa expire and living apart abroad from your husband for a few months might make them question the validity of your marriage.
Why not call immigration and explain? I think the rules on not leaving during an activate application have been relaxed - so you might be able to make an application now, travel aboard, and pick it up when you get back.
As a bonus, if you do end up needing to apply for a new residency status from scratch, your residency time resets, which might put off the time that you become a permanent tax resident.