I am 9 weeks pregnant and I have a 13 month old who is still feeding, any advice on tandem feeding?

Hi, I have a 13 month old daughter and I am 9 weeks pregnant. I am still feeding and I wish to feed my next baby. Any advice on tandem feeding please? I am not sure whether to wean my daughter or to let her self wean, I have read that sometimes the older baby will go off the milk due to the taste caused by pregnancy. I would be grateful for any comments.