Am I going to lose my milk supply?

I've been breastfeeding my daughter for 19 months now. Since Wednesday evening, I haven't breastfed her because I've had to be out of town for an intensive training. I've also only had the time to pump about 3 or 4 times. Obviously, I'm not producing as much at this point anyway because my daughter doesn't breastfeed nearly as much as she used to. So engorgement hasn't been an issue. I'll be back with her tomorrow afternoon, but I'm just wondering if my supply will be able to recover. I really don't want her to wean! For you moms who are super knowledgeable about breastfeeding, should I be able to get my supply back up with lots and lots of nursing? Or is 4 days with practically no pumping completely devastating to supply? Thanks!