i suppose it could affect your fertility if it caused irregular menstrual patterns but it could also help - it regularized me a bit actually. generally being healthier will probably help your fertility and hypothyroidism can mess you up quite a bit. if you respond badly to synthroid you might want to try nature throid or armour thyroid because they are more complete hormone replacements.
hypothyroidism. will taking synthroid affect my fertility since it causes irregular menstrual patterns?