Hi im 14 weeks pregnant. Ive had underactive thyroid for 2 years now but just mild. Ive only ever been on 25mcg. I got bloods checked less than 2 weeks ago and my thyroid levels are still in range however 20 minutes or so after i take it i have a strange sensation in my chest and my hearts racing and i feel weak. ive only noticed this the past week or 2. Is this normal i really hate the feeling it put me off taking it this morning. Thanks
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