Confused...positive and then bleeding

Hi,

I am feeling slightly confused and need some advise. My husband and I have been TTC since August for our first.

I tested positive on the 19.12 and since the 19th and 25th have taken about 10 test (partly because I couldn’t quite believe it and partly because seeing those 2 lines/cross appear made me so happy). I took a test on Christmas morning to surprise my husband as part of his Christmas present. Fast forward to lunch time and I start bleeding. We then went to see the out of hours dr who said it was my period and he doesn’t think I was ever pregnant. I am so confused 😞 how can 10 test, 3 different makes, all test positive and then the doctor says he thinks I was never pregnant. Any advice or thoughts would be greatly appreciated. I am feeling very deflated.