May i still have a chance of being pregnant?

Becky

I had my second

IUI

on 12/24. I tested since 11dpiui-15dpiui and got a Super White Negative. Didnt test anymore. Stopped taking progresterone on 14dpiui amd today i am 18 dpiui and 2 days late. Last cycle i got periods 16dpiui. What do you think? Could i still be pregnant after all those negative tests? At least at 15dpiui shouldnt be like the faintest line there if was pregnant,instead of thet Big Negative?

Until now no sign of Af,but either of pregnancy.