2WW is over

I had IUI two weeks today and have been waiting for my period to show its ugly head. No period and I manage to get to day 14 post IUI so I’m thinking the test is going to show the famous words,pregnant but now,it flashes up not pregnant and so I am very disappointed. but also at a loss as every other IUI cycle my period has appeared either the day before or 2 days before testing day. Any advice anyone can give me?? Thanks and baby dust to all those still on their 2WW.