Fish

I'm on day 20 of my first pack of Loestrin 24 and I just started spotting. Granted it is very light but I just want to make sure this is normal. I remember reading that it was normal but it doesn't make sense physiologically that I would bleed because of the hormones still in my system. No chance of being pregnant as I haven't had sex yet...I was thinking this weekend would be the right time but obviously not if I'm bleeding...boo