Is there any chance i had my period in pregnant? 3 days late and neg test. first night quite heavy and ends about 6 days. thanks.

Don't think so: A woman cannot get her regular period and be pregnant at the same time. However, she can get pregnant a week or two after her regular period. If she has some spotting or light bleeding that doesn't look like her normal regular period, she can check a urine pregnancy test about 3 weeks after sex (3 weeks after when conception might have happened) to see if she is pregnant.