ER visit

Ugh I’m so freaked out I had some light spotting on Friday afternoon and it lasted a couple days paired with some mild cramping so my husband (this is his first baby) insisted that we go to the doctor. When we tested at the clinic they told me I was about 8 weeks and last night at the ER they said I’m only measuring 5 weeks 3 days and they only saw a sac. Should I be concerned or just wait until my OB appointment on the 7th? My first pregnancy was the easiest ever considering I spent 6 months not knowing (crazy crazy situation) I’m trying not to google too much because everything says either it’s nothing or it’s something scary just looking for some personal opinions to ease this mamas mind.