One Positive then 5 Negatives

So.... it was Saturday and I had just got back from town about 3 o’clockish time and I had picked up a pregnancy test. It came out as positive I was over the moon! So I thought I would do another to double check so it was about half past 5 in the evening and the test came back as negative? So I went to the shop again and got another test to try again in the morning as I thought it may have been to late in the day? So I took the test the following morning and it was negative again! I took 2 more tests and they were all negative.....

What can this mean? People have been saying it may have been a chemical pregnancy but I have had no bleeding???? Someone help me please I’m loosing my mind about wondering what the hell is going on😩