Dont worry too much, clomid makes a lot of women ovulate later than they are used to. It also changes from cycle to cycle. For my first clomid cycle, I ovulated on cd16. Monitoring the cycle usually starts a few days after your last Clomid pill is taken and may involve ultrasounds and blood work every few days until you ovulate. I'm on 100mg of clomid this is my 2nd cycle. The first cycle I ovulated on day 18. I am curently on day 20 and still have no sign of ovulation. For women that do not ovulate on their own, the average day that ovulation occurs is about 8 to 10 days after completing a 5-day course of Clomid. That means that a woman taking Clomid on days 5-9 will often ovulate on about day 16-20 of the cycle. Here's the thing. there's no one day that everyone ovulates when taking Clomid. There are Clomid calculators online that claim to tell you when you'll ovulate, but they really are just a best guess. I either O on day 19 or 20 on clomid. I heard it's not unusual at all. I didn't ovulate either and it worked for me on my first try. I second the boobs hurting.major ouchies.but it's worth it and I know it's the clomid doing it so I don't get my hopes up for pg. It will depend on whether you started your Clomid cycle on day 3 or day 5, and your body’s own personal rhythm. However, your doctor will pay close attention to finding out when you ovulate so that you can time sex right, or know when to come in for an IUI if that is the route you are going. However, some patients can ovulate even on CD 20. It is best to combine ovulation testing with Ultrasound. It is best to combine ovulation testing with Ultrasound. Helpful, trusted answers from doctors: Dr. Jurewitz on ovulation in 25 day cycle: Most women on Femara (letrozole) will ovulate on CD 10 to 16. Quality Customer Service. Buy All Your Favorite Meds For The Cheapest Prices Around. Find International And Canadian Online Pharmacy Prices. Ovulate Day 20 Clomid. On Clomid you should ovulate anywhere from 5-14 days after the last pill. The first cycle I took it I didn't ovulate but 2nd cycle I ovulated day 20 and third cycle I ovulated day 19.