I began a new birth control this month. I finished out my pill pack like I was supposed to. Took my week off for my cycle then inserted the NuvaRing back on Sunday like starting a new pill pack. It's been my 3 weeks and I took it out for my cycle like I was supposed to. It's been 4 days and no cycle? Could I just not get my period? I never heard that it was common for the ring but switching birth controls like that might have messed up my body a bit?