Absolutely. I bf until 18 months, have 4 kids, and bf while pregnant. I was told when I wad pg with my 1st that even though the baby doesn't get as much nutrition from nursing at 18mo. That it is best emotionally for them to help them cope with life issues. They will be less likely to have attachment issues, helps them not hey over simulated etc
My daughter is almost 3( in january) and im 32weeks she still refuses to give it up. Ive noticed im producing colostrum now but she doesnt seem to care and doesnt want to stop. Everyone is dif so you might dry up, you might not. If you do dry up before baby gets here it might actually help you wean your first off. I sometimes wish i wouldve dried up lol
Best of luck. I got pregnant while nursing and my supply took a huge hit - my son was a year so I stopped. That was the right decision for me. Do what is best for you.