Heart broken and confused!

Hi ladies, I suppose I just wanted to share to see if anyone had words of wisdom!

My partner and I are trying for a baby at the moment, have only been trying a month so far, and I had the IUD removed early December. I got my period 5 days after IUD removal, it was a regular period so I thought perfect! Body is going back to normal super fast. I tracked for ovulation and sure enough the symptoms of ovulation happened bang on 14 days into the cycle! I waited anxiously and did multiple pregnant tests then finally on the date of my due next period (last Sunday) I had a faint positive. I was in shock. Then the next morning I tried again and the test was also positive and the line even darker this time. I went to doctors to get my blood test and this came back negative which confused the doctor as I would have to be very unlucky to get 2 dud tests. I still haven’t got my period and the test I did today was still negative. Has anyone else experienced this and actually been pregnant??? My partner has since found out he has to have a procedure done down there to remove a mass and the doctor said the scarring from surgery could mean he won’t be able to have children due to the location of where the mass needs to be removed (right next to the ejaculatory gland). We are desperate for good news at this stage!