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Since you have already got your period for this month not to worry about pregnancy
. But you need to understand that when male gets sexually excited there is secretion of pre-ejaculate
fluid which is also rich in sperm and ejaculation need not take place for pregnancy as even pre-ejaculate fluid can cause pregnancy. If you want to avoid pregnancy, use condom or choose other contraceptive like oral contraceptive pills
taken for 21 days a month.