I have a question

I have a son of 1 year and 9 months old am still breastfeeding him and i just found out am pregnant is any way will affect him or the baby ?i been trying to stop breastfeeding him but is so hard he wont stop crying as a mom i dont like to see my baby cry is theres any trick to stop him to like my breastmilk if so pls let me know anything will help me