7 weeks exactly scan fetal pole???

Jane

Hey so I had a scan today to check if the baby is growing in the right spot and he saw a fetal pole. My doctors machine is really old so he said to come back at 9 weeks to detect a heartbeat too. Is that normal to only have a fetal pole at 7 weeks? I have a child but we never knew I was pregnant until 9 weeks so I am not aware of anything what would happen before. Doc said it’s normal to have a fetal pole between at 6 and half weeks and 7 weeks so am I behind couple of days or what? Sorry for the silly question. Just overthinking everything since I have had 3 miscarriages before. Thanks whoever answered xx