With PCOS, my cycles were always irregular, so I couldn't rely on early symptoms. I'd highly suggest waiting at least until your missed period before testing, as early tests can often give false negatives.
Within a week of conception, it's very hard to know for sure, though some get weird food cravings early on. I suddenly wanted sour pickles out of nowhere, but the urine test is the only real way to confirm.
Oh, the two-week wait is the absolute worst, I used to test every single day and drive myself crazy! Honestly, try to distract yourself because testing too early just causes unnecessary panic.
I am currently 6 weeks pregnant and even I didn't get a clear line until 4 days after my missed period. Did you check with a home kit yet or are you waiting for your date?
Confirming so early is tricky. When I was expecting, I waited patiently and then got a blood test done. Take care of yourself during this waiting period, your body is doing a lot of work.
I felt a strange tugging sensation in my lower belly just a week after trying, and my heart just knew it. But I still waited for the missed period to do the test, and seeing those two lines was the most emotional moment.