Hi Stacey,
If you get what you need by pumping, then I would think that is ok, but if not, then I woudl add an extra pump. Even if you aren't getting milk, it will help increase the supply. You may even want to pump after you nurse her when you get home, that will help increase your supply even more. Your body adjusts to the demands so what you ask of it, it will eventually start producing. Just make sure to keep your water intake up high!!!!!
In 5 weeks when you start bfing full time your body will start making milk full time. Don't stress about it one bit because it will happen easily. It may take a week to get the supply up to what you need it to be, but it will get there. Again, maybe just pump after each nursing session to help start it.
Supply does drop during periods, so that is completely natural. You may even notice that she wants to nurse a little less cuz it may taste a little differently to her.
Hope this all helps!