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If it's an early pregnancy I don't think sex is allowed. You should check with your doctor.

As I know sex is not a problem during pregnancy and you can bleed sometimes because when you are pregnant pregnancy hormones increase the mother's blood volume and expand the blood vessels, causing congestion of mucous membranes including the cervix. Penetration results in minor trauma to the vaginal wall and a slight rupture of blood vessels, resulting in light pink or brown bleeding. So it is supposed is normal, but anyway if you are worried is better to ask to your gynecologist