Positive followed by negative pregnancy test

Hey guys so i was going on holidays and noticed my period was going to be due, I went to the doctor to try and get a period delay pill, he prescribed me norethisterone, I tested days before taking this and I had negative tests. I only took 3 out of 30 tablets as I felt sick on the third. I took another pregnancy test and it said I was pregnant, on a digital test. The next morning I bought more tests. 2 negatives (not digital) I still don’t have my period I stopped the pills two days ago I still have pregnancy symptoms I’m just wondering could I be pregnant and be getting false negatives ? Or early miscarriage ? :(