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Not to worry. Pregnancy
may not happen that way. Usually vaginal penetration of penis is needed to make pregnancy. Periods can be delayed even due to stress
. You can wait till your periods start even upto 10 days after that. If periods delayed more than 10 days then you can do a Pregnancy test. If it is negative, you could be having hormonal
disturbance. Just remember to prevent pregnancy condom is must, even pre-cum on the penis can cause pregnancy if penis is inserted in vagina. Be cool. Avoid stress.