drop in supply

I am recovering from a cold and my milk supply seems to have dropped. I nursed as normal through my cold and never took anything other than ibuprofen. Now when she nurses she pulls at the nipple as though she isn't getting enough sometimes. I have a small freezer stash that I've been giving her and I've started pumping more and taking fenugreek. Is it normal to have a drop in supply after sickness? She is almost 4 months, but I want to keep breastfeeding until she's a year.