I've had hypothyroidism since 1994 and had been taking ortho tricyclen or marvelon for years and have always had normal TSH levels. Three months ago I switched to Yaz. After being on Yaz for 2 weeks my TSH levels rose from 3.0 to 4.6 and after 3 months on Yaz the TSH levels rose from 4.6 to 6. I am in the process of switching back to Marvelon an... more