Prescribed utrogestan and can’t see sac when I was supposed to be 5 weeks?

I was prescribed utrogestan when I went to see my Gynae to confirm my pregnancy. Based on my lmp, I was supposed to be 5 weeks but did transvaginal scan but can’t see anything. Not sure if it’s bcos it’s too early. I’m going to see my Gynae next week. Not sure if I’m going to see a sac next week. Kind of worried. This is my baby #2 For my baby #1, my Gynae also prescribed utrogestan and everything went well for my pregnancy. I gave birth to a healthy baby girl.