Thyroid and Pregnancy

I've had hypothyroidism and have been on Synthroid since I was 16. Throughout the years, my levels have gone up and down and my dr has change the dosage and monitored my levels. I'm 6w4d and my obgyn wants me to go to a maternal-fetal dr tomorrow to give me an ultrasound and to up my dosage even more. My levels have skyrocketed since I've become preggers. So, my concern/question is have any of you ladies had a thyroid issue but still had healthy and happy babies? I suppose I'm in panic mode, so I need some positive words. Thank you ladies. 💕