Around now: In a spontaneous cycle, ovulation occurs when a follicle reaches 18 to 20 mm. It sounds like you are in that range, and your endometrial thickness is also normal for midcycle. I would expect that ovulation is taking place now or within 24-48 hours. You can confirm that ovulation occurred by checking a progesterone level in about seven days. Good luck!
Answered 12/2/2015
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