I had unprotected sex 8 days after my period,my next period came 3 days early lasted 2/3 days tests were neg despite all symptoms of being pregnant ?

Can retest in 1 week: Pregnancy tests are very accurate and not affected by foods, herbs, common illnesses, sexually transmitted diseases, or medications. A correctly done urine test gives a reliable result 3 weeks after sex (3 weeks after when conception might have happened) or 1 week after missing a period. If done sooner, a positive result is likely real, but a negative result may be due to testing too soon.