How accurate are pregnancy tests once taken let's say two days after a late period?

So my period is projected to start tomorrow. If it doesn't show then my Flo app says I can take a test on Sunday. These are the symptoms I've been having for the past week or so: 1. Frequent urination, 2. Sore breasts and nipples, 3. Mild cramps 4. Vivid dreams of two positive pregnancy tests, 5. Swelling in my ankle and 6. Sensitive strong smell. I try not to get my hopes up but after two losses in 2023 and having amenorrhea I feel as though my chances of conceiving are pretty low. I'll probably wait until my period is a week late to test but what are the chances of me getting a positive pregnancy test on Sunday? Just for reference my last period was from May 31st-June 5th.