Please help me!! Idk what to think!!!!!!

AF was late by 1 day, then Had AF show up & was super light. Then the next day (day 2) AF was SUPER heavy with a lot of clots. Had a terrible headache all day, cramps and lower back pain. Then day 3 (Friday) there was nothing - just spotting & now, day 4, AF is completely gone... CP has been super high, soft & closed & my bbt never went below the coverline. I took a test on Friday & was negative :/ but I’m wondering, is it still possible to be pregnant? I’ve never had a 2 day AF, especially where the first day is so light!!

When would you think I should test again?? I’m so confused. Here’s my chart for reference. My coverline from My last cycle was at 96.9.