This may be an odd question.

So I went to the ER yesterday for Covid oddly enough. They kept asking me if I was pregnant before a CT and I kept telling them no. My husband and I did end up having sex when I ovulated and my period is still a week out. We’ve been told that we can’t have children naturally anymore due to issues with both of us I’m not going to discuss. They ended up doing a blood pregnancy test they resulted it say Negative but then put remarks basically questioning what they resulted. Has anything ever had this happen and turns out they where pregnant.