Everybody's hcg levels are so different. I honestly have a love hate relationship with those tests. I love the fact that they can help you kind of see at home that your hcg levels are going up, but they can be very misleading as well. I got a 2-3 week reading at only 14 dpo. My levels have just risen quickly, but that is why hcg levels are not an accurate way to date a pregnancy. My levels have been going up every 24 to 29 hours, but I have friends who had levels that didnt rise but every 72 hours, which is normal. You could just be in that 72 hour range. Don't stress it. I had a previous MC and I admit I have been very nervous about having another one, but I am trying to stay positive, just try to do the same thing.