First Ultrasound

I had a private ultrasound done today and they only do abdominal. I'm 6w2d so I was hoping to see a heartbeat but I measured behind at 5w6d and no heartbeat yet. Everything measured symmetrical so she said that was good and 4 days off isn't uncommon this early. I know my dates are correct so I'm just measuring small but I'm also reading having a tipped uterus can make it hard to even see a baby abdominal at this point during pregnancy. My bladder was so full she barely was able to get the right angle to see much of anything. Although I know I have a tipped uterus this is the first time I've ever measured small and not seen a heartbeat by 6 weeks according to my dates. Hubby knows I'm a little worried though I try not to be, he's a sweetheart and reminds me that every pregnancy is different. Just a little nerve wracking after losing Ean at 13w2d in October. My progesterone was low with just the 200mg oral so I had the injections and then also used suppositories. Optimal at this stage is 26 so I had to increase progesterone to daily dose of 400mg oral and 200mg suppository but it looks good now.