1st IUI- TWW- 11 dpt. When does the trigger go negative?

This is my first IUI after getting submucosal fibroids removed, my husband has some morphology and tiny bit of motility issues (2.5 forward progression). Did Femara for 5 days, then switched to estradiol to thicken lining and still taking it. Trigger was 2/14, and actual IUI procedure was in 2/15. On 400mg x 2 a day of progesterone. If you tested positive hcg for the trigger did you ever get a negative test before the pregnant positive or did you show hcg till the 14dpt test? 🤞🤞🙏