i am worried about my TSH levels and the dosage i am using to cure it

hello i have been diagnosed 7 monthes ago with hashimoto disease which affected my thyroid and i have been doing regular blood tests since then, but lately my TSH level came to be 3.16 while the last time i had it checked out it was 2.16, plus my period is irregular and late, i have used the dosage of (50mg) from the eltroxin medication those 7 months so i have been wondering should i start using the (100mg)??

note:i am gaining lot of weight although my food is the same and i practice sport everyday and that didn't change too,thank you

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