I received implantation bleeding 4 days after ovulation my period wafrothy sep11-15 it is now the 30th of sep when should I take a hpt?

1 month from period. I would wait about 4 weeks from your last period. That is a reasonable time to check. Also you can be pregnant with a very early pregnancy and the pregnancy hormone will be lower. When the hormone is low it may not be detected on a urine test. So waiting 4 weeks is the best time.