Breastfeeding while pregnant

I'm pregnant with baby #2 and my son is 9 months old and is EBF. I asked my doctor at my apt today about my supply dropping due to pregnancy and if there was anything I could do? He told me it's time to ween my son. I'm not ready to ween. Is there anything I can do to up my supply. It hasn't dropped yet, I just want to be prepared for it. Also, I read fenugreek isn't safe while pregnant? I had wrote this on my chart today and the doctor said nothing about it being harmful? I take it daily to up supply. Any advice will be helpful. TIA!😊