For countless women, trying to conceive is a daily commitment that may include religiously charting their basal body temperatures, using ovulation predictor kits, taking prescription drugs or experimenting with herbal therapy.

The process can be both daunting and exasperating, especially for women with irregular and long menstrual cycles who have to guess when they might be ovulating from one cycle to the next – if they're ovulating at all.

"It is hard because for a few months I will be regular and it makes it easy, and then I go four months without a cycle and it makes it very difficult," says Laura Wedeking of Bryan, Texas, who dates her "erratic" cycle back to her teenage years. "It is really annoying when I have a cycle three months in a row and I am regular and I don't end up pregnant, and then I go for three months without one and still nothing."

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