ET 10. 2 mm n late periods. Possible?

Did iui on 9/1/22. Baby dance on 12/1/22( as advised by doctor) #Follicle size 18mm and 20mm(ruptured) #trigger shot on 8/1/22. #Stop progesterone on 20 days post iui. #Sperm count :139million/ml. #Endometrium: 9.4 #Late periods by almost a week now. #Tested negative on 19day post iui on urine pregnancy kit. #Got TVS on 22 days post iui. Dr said my endometrial thickness is 10.2 mm so even if the pregnancy cudnot be predicted at the moment, there is still hope and asked me to wait for another 10 days n visit him again. He told me that had the endometrium thickness be 7mm, he cud Hv declare already that pregnancy won't happen this cycle. But since it's 10.2mm there chances of late pregnancy. N if periods come that's different story. Is late pregnancy possible? Please help me understand 🙏