Hi!
Take a test. I ALWAYS recommend taking a pregnancy test whenever there is a question! Its pretty important to take your pills every day--especially with the very low dosages that we use now. If you are not pregnant, your period may be light because you forgot a few here and there. If you are pregnant, well, you're pregnant!
The CRITICAL pills are the ones during the first week of the pack. You really have to start the pack on time, and take the ones in the first week every day. If you miss some in this week and have to double up, you can actually induce ovulation!
I hope everything works out!
Good luck!
Dr B