Hello,
Were you diagnosed with hypothyroidism? I was diagnosed with hypothyroidism (under active thyroid) over 8 years ago. I am currently taking Levoxyl to regulate my thyroid levels. I am unaware of any alternative or over the counter medications. I would suggest visiting an Endocrinologist and discuss your situation. He/She will probably do bloodwork and prescribe medicine to regulate your thyroid.
Also, an untreated or undiagnosed thyroid disorder can cause issues with pregnancy and an unborn child.
Side note: I recently gave birth to a healthy baby girl.
Please feel free to ask me any additional questions. IMO, you will probably need doctor prescribed medicine to treat your thyroid, and you will need to take this medicine for life.
Best of luck.