Spotting before period missed Yaz pill, pregnant?

I have sex pretty regularly sans condom with my boyfriend. I am, however, on the pill. I take Yaz. I am so good about taking my pill but things have been crazy lately so I missed 2 pills in this pack this month. Not in a row. I missed one the second day of my third week and one somewhere in my first week. I took the pills the morning after I forgot and took the next one at the right time that night.

I have been spotting for the past 5 days now, its very very light. I am not supposed to get my period until this coming Thursday. I have read on different websites that spotting before your period could indicate pregnancy. I don't have tender breasts, don't feel nauceous, don't have any other symptoms but I'm still worried about being pregnant. However, this did happen last month, that I started spotting about a week before I got my period for 3-4 days and then got my period two days late. Is there a good chance I am or am not pregnant?

Please please please please please help because I'm really scared.

THANKS!
K