Stress, changes in diet and activity levels can all wreak havoc on one's cycles.
So, for the time being, I'd say to ride it out. A good rule of thumb, to make sure the irregularity isn't due to a medical condition you need treated (like PCOS, endometriosis, etc.), is that if the irregularity continues through three cycles, or recurs again a few times during the year, to see your gynecologist and have your annual exam, being sure to mention the irregularities.
So, if during the next two months things continue to be wonky, go ahead and get an appointment. If not, don't sweat it.
Editor and Founder, Scarleteen
My epitaph should read: "She worked herself into this ground."
-- Kay Bailey Hutchinson