Oh my god yes, when I was 19! My period didn't come and I panicked so bad. I waited and I waited but it still never came. I held off on buying a test because I remembered that periods can be delayed by stress and other factors.
In the end I just skipped one and my next period came when scheduled but it was a scary month. I was looking up abortion procedures and how much time my uni would give me off for it hahah. But in the end I needn't have worried.
Looking back it seems silly especially since all the sex I'd had (and have) is safe, and there weren't any accidents. But when your period doesn't arrive your brain goes into over-drive. I'm sure even celibate nuns must have felt this panic too hahah.