TSH level too high

Doctor said I have hypothyroidism and asked me to do a 2nd blood test. Results came today and my TSH level increased from 6 to 9. Nurse said something about another thyroid name not sure if its T3 or T4 and that my level is at 300 when the normal range should be less than 5. She said they'll refer me to an endocrinologist and ask me to start taking meds for TSH

Not sure how to feel about this ? Is this a serious issue in ttc ? Will I be able to conceive ? Any ladies who went through similar issue and conceived ?