Ovulation test: low fertility to ovulation in one day?

April • I`m 29 years old (30 in March), my husband is 38, and we have been actively trying to conceive since September 2012.
CD 9, 11, and 12 I took the ovulation test and got just a circle, no smiley at all. Then today, CD 13, I took it and I have a solid smiley all of a sudden! Is that normal? This is only my second month using this brand of test and last month I had 8 days of blinking smiley faces before I finally got the solid smiley. It just seems odd! And I ovulated on CD 18 last month. CD 13 seems way early, but I'm also on Clomid, which I hear can mess with ovulation.
​Anyone out there experience the jump from no smiley to solid smiley in a day? Any help is appreciated! =) 

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