Pregnancy and Breastmilk

So I'm 90% sure I'm pregnant (I just haven't gotten a positive test yet) and my milk supply has dropped drastically no matter how much my baby nurses. I went from pumping 5-8 oz on a typical day to 1-3 oz. I was just wondering if anyone else who may have gotten pregnant while BF had a drop in supply initially and when/if it went back up? Also is there anything that can help? I've been power pumping, drinking lots, eating lots of healthy fats and oatmeal, as well as brewers yeast and flax seed. I won't do fenugreek because it gave both my baby and I bad digestive issues.