I am 21 DPO ( I think) and on Monday my HCG levels were 625 and they were concerned becasue they didn't see anything in the ultrasound. Well I called today to check to see what the levels were from yesturday, they told me they needed to be around 1200-1500...they were 2200!!! The nurse said that their might be more than one in there with those levels, they trippled!!!! What do you think??? They want me to come in on Tuesday for another ultrasound so make sure they implanted in the uterus. ( My mom and grandmother both had a tubal pregenancy).