Planning to have a baby without contraception, having an endometrial lining of 1.1cm, and not having a period cannot rule out the possibility of pregnancy, and the chances of pregnancy are relatively high. Therefore, it is necessary to check the urine pregnancy test, or go to the hospital to check the blood progesterone and HCG to see if you are pregnant. There is a time limit for these tests. It takes more than 10 days from the last intercourse to check for pregnancy in the blood, and more than half a month to check for pregnancy in the urine. For a shorter period of time, a negative test result does not exclude pregnancy and further monitoring is needed. If the test is negative and you have not yet had your period, you should rule out the possibility that there is a problem with the test result, and you need to do further tests and continue monitoring until you have your period. Or do other tests to check what is causing the lack of menstruation before stopping the test.