i need help

so I found out I was pregnant about 2 weeks ago, and I went to the hospital on last weekend and they told me I was 6 weeks I just went to the doctors on Wednesday and she ended up telling me I'm 5 weeks , but they keeps saying that the sac is super tiny and to go back on the 7th .... I know I am pregnant but I'm going crazy the actual labor doctor said that they wanted to make sure the baby was fine but there not telling me anything 😏 what do I do call and demand answers or just leave it alone till the next ultrasound