Hello

I have been testing everyday for a few weeks Monday the 19th I had 3 strong positives throughout the day and have had negatives the days before and after. I am due to have an examination and procedure done on weds (all last minute) and need to try see if I’m pregnant as this may cause a miscarriage if I am and don’t know. I took and ovulation and pregnancy test this morning hcg negative ovu came back positive ?? Anyone experienced this ? Is it sign of af coming ?