My urine pregnancy test came positive today morning on 23/1/2020. It was a dark clear positive. My last period was on november 27th and my period dates are irregular. I have gone to the gynaec and she has done a ultravaginal scan and said she cannot see a sac in the uterus and suggested a beta hcg. Have given a sample for beta hcg and waiting for the result until tomorrow. Endometrium thickness is 14 mm. I am not sure of how many weeks of pregnancy I am in. I tested the pregnancy test 12 days ago and it turned out to be negative and today the test it big fat positive. Doctor suggested to take the scan after 2 weeks to see if there is a sac. I am scared. Kindly help me out and let me know if this is normal.