Wait for the next few temps to see if they rise above the cover line again. Could be a fallback rise pattern, which is actually quite common. Many women have a fallback on days 3/4 when the corpus luteum takes over progesterone production. See what happens the next few days. You need 3 more temps at least 0.2 above the coverline. At least one of any of the temps taken after the fall must be at least 0.3 above the coverline to qualify the pattern you see as a fallback rise pattern, and therefore confirm ovulation.