Took aftera last month period came on time7/10. sex8/2(thought i was safe) because period due8/4 but no period.took plan b 8/4 just in case. still no period yet. when did i ovulate? did aftera affect this second cycle and could i be pregnant!????

If your period is regular, the ovulation should happen in the last week of July so chance of conception had been high if you did not take plan B on 8/4. Plan B pill should be successful because you had taken it within 72 hours of unprotected sex and this method can delay your next period. Do not abuse plan B, use contraceptive method(s) if you do not want to get pregnant.