Okay I'm new to this so bear with me.

I was supposed to get my period 3 days ago and it's normally never late. My last cycle was 28 days ago and still no period. I know other factors can cause a late period such as stress and diet but I was curious on the best time to take a pregnancy test. I'm really anxious cause my partner and I have been trying for awhile now to conceive. Any advice is greatly appreciated😊