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I need to know a few details before coming to a conclusion.How was the nature of bleeding on these two instances ? When was your expected date of periods normally ?
When did you find out you were pregnant and how ?
It is possible that your Last menstrual period is 10th or 19th .An ultrasound
at later period can confirm this.However , please provide these details for a better advice.You can provide these details as comment to this reply or feel free to mail me.