Af 4 days late all the symptoms and BFN

I'm 4 days late for Af and I've had on and off cramping,heartburn and backache, mild acne I'm a super regular 28 day cycle never late and never have this many symptoms at once. I'm wondering if anyone else has gotten a BFP after several BFNs and how long did you wait to make an appointment for a blood test? Did the blood test say your pregnant and the tests did not ?