Positive-Negative pregnancy

So I was feeling extra tired and my breast were kind of sore so I bought a pregnancy Test. I took the first digital one and it came back positive, two days later I took another One and positive. I went to the doctor and first the test came back negative and was we were talking and 30 min later the doctor says she sees a faint second line on the test and she will say it’s positive after 30 Min. 2 days later my period comes and I take another test and now it says negative. I’m a little sad, I told my Bf and everything. I just don’t know what to think, like was I prego and lost the baby “sigh”. I can’t stop thinking about it.