Yes! Your period is trying to regulate with the the birth control and it's common for your period to be a little irregular before it gets on the right track!
It takes about 2 or 3 months for your body to grt used to the birthcontrol. My periods were all over the place the first few months. It made me have a 26 day period and I had 2 light ones a Month sometimes to. Don't freak out. You just need to give your body time to get used to the bc. :)