Given the information you provided (bleeding twice a month) you might be experiencing normal menstrual bleeding and ovulation bleeding. Ovulation bleeding occurs when ovulating, that is approximately 14 days before the start of the next period.
The ovulation bleeding is usually light (might last for several hours up to couple of days). Pain on the side of the ovary releasing the egg (mittelschmerz) might be present. The ovulation bleeding might be caused by a hormonal imbalance.
The level of estrogen drops suddenly during ovulation resulting in light bleeding. Oral contraceptives are well known to interfere with the female sex hormones and might cause ovulation bleeding, too.
The possible hormonal imbalance might be a reason for your temporary inability to conceive.
You might want to visit your gynecologist and have a physical examination and laboratory hormonal tests to check for a hormonal imbalance. An ultrasound scan might tell you when to expect your ovulation and to try to conceive.
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