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Your chances of pregnancy depend on the regularity of your periods and bleeding pattern. If you had intercourse the day before the start of periods, then chances of pregnancy are less as the ovulation day would be later after you finish with periods (if cycles are regular and of 28-30 days).
If the bleeding /spotting is continuing, then get yourself examined by your gynecologist/healthcare provider to look for any hormonal disturbance causing abnormal bleeding.
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