The golden rule is to wait for the first day of your missed period for an accurate result, as that's when the pregnancy hormone is strong enough. I waited patiently till my due date and got a beautiful bright double line! Keeping a positive mind and waiting is always the best way.
Listen, testing too early will only give you a faint line and double your tension, so don't stress too much! Just wait until you actually miss your period date, and then test with the first morning urine. Treat yourself to some ice cream while you wait, okay?
When I was trying to find out, I was so impatient and tested early, which only gave a confusing negative. From my experience, waiting till your period is at least one day late is the safest bet to get a clear answer. Our bodies are doing so much work, so just rest well and give it time.
I completely understand how agonizing this waiting period is, the anxiety of wanting to know can literally keep you awake at night. The best and most reliable time to check is on the day of your missed period, or at least 14 days after you think you conceived. Try to distract yourself with nice movies, I know it's so hard but you can do it.
The most accurate time is about one to two weeks after conception, ideally once your period is missed. Just take it easy, take deep breaths, and test when the day comes. Wishing you all the very best, dear.