YEs it happens often
A girl that I found on the FF circles was taking Femara--went in to get her hcg trigger and was told there was no need because there were no eggies. THen a few days later she got a +opk and she o'd AND she was pg. Sooooo there is hope!! HOwever if you are not pg Ihope they are planning to increase your C. Oh and my personal experience. I took 50 mg of C 2 mo--no O. I took 100 mg of C--my doc did not do a preO u/s but checked my P at cd21--she said no O and I would go on to 150 mg of C. Well I was pg that cycle so what do those docs know????

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Tracie
DS#1 5/8/99 (Clomid 3 cycles, 1 50mg and 2 100mg) weaned at 27 mo pp after getting pg with ds#2
DS#2 3/25/02 (conceived while bfing ds#1(25 mo old), no ppaf) weaned at 24 mo pp to get ppaf back
3 Angels 03-2004, 06-2004, 07-2004
DS#3 7-14-05 (Clomid 2 cycles, Femara & hcg at 5dpo 1 cycle) weaned at 31 mo pp
1 Angel 12-2007
TTC#4
Cycle 1: Femara 5 mg(cd4-8), HCG 10,000 trigger cd 13
Cycle 2: Femara 5 mg(cd5-9), HCG 10K trigger cd13, 200mg prometrium
Cycle 3: Femara 5 mg(cd5-9) HCG 10K cd12, 200 mg P 11 dpo hcg 69, P 55.6
17 dpo hcg 1421