Hey guys! Tomorrow I find out the results from my blood test! I am *so* excited but nervous at the same time. Quick recap: I found out I was pregnant in the evening of Aug 30th. Rushed to the doctor's the very next day to get a blood test done to determine timeline. They told me that they'd want to book me for an ultrasound after finding out the hCG levels? Why do they do this ultrasound? Isn't it very early and she'd be very very tiny still? Can someone help me with a timeline? Do you calculate your weeks pregnant by your the first day of your last period? Or the last day of your last period? Or do you calculate from the actual date of implantation? I tried a pregnancy calculator which asked for the first day of my last period (which we estimate to be about July 25th) and apparently it told me that my conception date was approx August 8th. So do I count from August 8th or July 25th? And regarding hCG levels: I read (or was told, can't remember!) that based on the levels they can tell me how far along in the pregnancy I am. I can understand that, but I was told that they'll also be able to have an idea if I'm carrying multiples? If the levels are very high, how will they know that I'm having twins, rather than just further along? We are very worried about this because twins runs very very strongly in my family. My mom's side carries twins all the way back - My great grandmother, my grandma, and my mom (I was a twin). On my dad's side, he's also got twins and a set of triplets. I've been told this puts me at higher risk for multiples, and having more than one baby right now would mean we would have to sit and re-evaluate the entire situation. So, how do they know? How much does this blood test actually show and how reliable is it? When will I actually be able to know whether we've got one cutie or more? What are they looking for in this ultrasound that they'll do so early? Thanks so much, I know that's alot, and I have been trying to research but can't find the answers to my questions.