am i pregnant

today is june 17. i had unprotected sex on june 9. i am expecting my period on june 12, but still no period, though there are PMS signs such as mild nipple soreness, dry paste like cervical mucus, and acne. i took two urine pregnancy tests: on june 14 at 1:30 pm (it was negative) and june 15 at 7:30 am (first morning urine, it was also negative). i took a serum b-HCG test today and the results are going to come out tomorrow. would the b-HCG test be accurate considering my timeline of unprotected sex and delayed period? am i pregnant?