Breastfeeding While Pregnant

Ha

I’m about 7 weeks pregnant and my son is only 3 months old (not planned) and exclusively breastfeeding. I’ve noticed a drastic drop in supply since becoming pregnant, and it seems to be getting worse. I know my son is getting frustrated, and I’ve had to give him 4 ounces of my frozen milk every night this past week before bed. My frozen supply is almost gone now and I’m very worried my milk is going to dry up soon. I know I can’t take fenugreek or drink mothers milk tea because they’ve been linked to birth defects, so I’m hoping someone here who’s breastfed while pregnant can give me some advice as to how I can increase my supply. Thanks in advance!