Synthroid and Menstrual Cycles

Jamie • I`m 32, been TTC for 2 years.
Is anyone on synhtroid and has it messed up your menstral cycles?? I've been on it for 30 days and my cycle is going on 35 days. My AF is about 5 days late. I am hoping to make a dr appt soon but in the mean time I am wondering if synhtroid has been known to mess up a normal cycle. TIA!