Mixing BM & Formula???

slstine19

My DS will be 10 months this week.  My supply has dropped and I have used up most of my freezer stash.  I am taking Fenugreek which has helped some.  

I thought I heard you can mix both kinds of milk, but am not quite sure so I have not done it yet and thought I'd ask here.  

If you pump 2 oz, can you mix 2 oz of formula with it?  

Thanks from a mom who is very happy she has made it this long, but very sad and upset at the thought that her supply is dipping.