Some cervical fluid after ovulation is possible because the corpus luteum, though its main function is to produce progesterone, produces estrogen in small amounts. This may cause you to see some fertile-looking cervical fluid, even after ovulation.
If your temperatures and other signs show clearly that you have already ovulated, then you can be confident that you are no longer fertile. It is also not uncommon to confuse semen and eggwhite or watery cervical fluid. Some women also notice some fertile-looking cervical fluid just before menstruation.
However, if your chart does not show clearly that you have already ovulated (with a clear and sustained thermal shift) do not stop having intercourse. Keep on considering the possibility that you are still fertile as long as you see fertile cervical fluid to make sure you don't miss a chance to conceive.