Can a pregnant woman take amoxicillin 1000g mg in there third trimester?

Most likely Yes. There is no evidence of second or third trimester risk with taking Amoxicillin which is a class b drug in pregnancy and safe like tylenol (acetaminophen). There might be of some risk-taking is in the first trimester. Obviously you want to take a medication that is indicated for infection so ask your ob/gyn as well.