Re: can I get pregnant?
Yes, TSH that high and T4 that low can make conception very difficult and a full-term pregnancy much less likely.
Having TSH no higher than about 1.2 and free T4 of 17 or 18 will improve your chances immensely. If it were me, I would not attempt pregnancy until these levels have been attained.
If you have measurable TPO antibodies, you should try to reduce them by taking 100 to 200 mcgs of selenium per day. They can be their own risk factor to successful pregnancy.
Why aren't you being treated now? It's unconscionable for a doctor to neglect thyroid health if he/she knows pregnancy is desired.