You have 2 days of (inactive) pills
when you are supposed to
start a period. So I bet you will have a spotting type period before your body gets used to the pill.
I also read that Kariva provides better pregnancy prevention with this type of BC, but you are right, it wont start until you have been taking it for at least 2 weeks.
You're on the right track using BC and condoms. Don't stop using condoms, there are a lot of STDs out there! I hope all continues to go well for you!