Your recent periods have changed, but only slightly. One time when I was on
the pill (loestrin, 8years) I SKIPPED
AN ENTIRE PERIOD
, obviously freaking out.... I ran to planned parenthood to get a pg test, and it was neg. The nurse explained to me that sometimes your body just does something different, and that's ok.
It wouldn't hurt to see the dr. If you buy an hpt, get an early response test, which very well may be more sensitive than the one your dr. would use.