It is normal to observe ewcm egg white cervical mucus twice in a menstrual cycle.
You could have ovulated twice, but chances are that you did not.
Double ovulation is possible and probably happens more often than in 1 of 100 cycles. About 1 in 80 pregnancies with spontaneous ovulation are twins, and about 2 in 3 of these twins are from double ovulation. However, double ovulation cannot usually be diagnosed by checking cervical mucus.
Egg-white CM comes from an estrogen increase in your body, and this estrogen increase happens normally twice in a menstrual cycle: At the time of ovulation, and again a week or so after ovulation.
It's normal to have EWCM twice in a menstrual cycle, each time there is the normal increase in estrogen -- once when you ovulate, and again when there is a second rise in estrogen without ovulation.