Positives then a negative multiple days later.

Has anyone had multiple positive tests over multiple days, waited a few days, then had a negative test? I tested positive last Thursday and Friday, multiple BFPs, randomly decided to test when I got home from a weekend get away, but the test came out negative. No period, no changes in how I was feeling before, besides the sore boobs and tired, which I’m still feeling. Can anyone help? Go in for blood work tomorrow, but won’t get results until Wednesday.