It may be a little scary, but you should really wait to see if you miss your period and take a test if you are late. I don’t think a little spotting when you first start the birth control pill is unusual. I had an extremely irregular cycle before I was on birth control. With first one I was prescribed I had quite a bit of spotting and also broke out in rashes. The doctor switched to a different brand and I was fine. Anyways, the best way to know for sure is to take a test or to see your doctor. Good luck.
Kate