Noticed a little light red (like pink) on my toilet paper this morning. 1st day of 9th week of seasonique (3rd pack)..should i be worried?

Irregular bleeding: having some break through bleeding while on a prolonged pill like Seasonique can be a normal thing. As opposed to wanting to wait for 3 months, your uterus has more lining than it can handle, leading to it shedding a little bit and giving you a small amount of bleeding. By 3 months you should get a full withdrawal bleed, which should normalize things. Not something to worry too much about