Hypothyroid and pregnant

Rose

I just found out I’m 5 weeks pregnant Monday so I went to my doctor to confirm and get my regular thyroid blood work done. Well my levels were off. So she increased my medicine but said not to start taking the new dose until Monday. Why wait till Monday if I’m pregnant and my levels are off I need to get them regulated as soon as possible so I won’t miscarry am I right. I’m also waiting on them to get me an appointment with a endocrinologist.