Ultrasound and actual due date!!

I had an ultrasound on the 13th (thinking I was almost 6 weeks) and they could only see the gestational sac. I had went into the ER because I was having severe cramping. I had to go in to have my hcg levels checked twice to make sure the pregnancy was viable, so since then I've had no idea how far along I actually was. I got another ultrasound today and I'm 6 weeks! Due February 15th (I was thinking the 9th based on my period). This is my third pregnancy and I'm so thankful everything is going ok. ☺️