10 DPO- AF Symptoms- When is the best time to test?

I am 10 DPO and having AF symptoms (on off cramps throughout the day) at the moment. 😫 Really hoping AF stays away this month, but trying not to get my hopes up and these cramps I’m having are not convincing me 😔. I’ve had no spotting. Just lower back pain few days ago and cramps. I measure bbt and my temps are still going up a little after a dip and are staying above the cover line. When is the best time to test what DPO? In the past I’ve tested way too early and I feel so down when it’s BFN. 😑😔