Hashimotos and pregnant question

Gu

So I am 31 weeks pregnant with my second but didn’t have any thyroid issues when I was pregnant with my first. I was wondering anyone who has had hypothyroidism during pregnancy if they had any complications with their pregnancy? Yesterday I went into pre term labor and they had to give me a shot and iv fluids to make it stop. My urine was good I have been staying hydrated they don’t know what caused it but I can’t help but wonder if it’s my damn thyroid doing it.