Missed period 12/21 & 1/20. Dec tests neg for pregnancy. Jan 18th tests came pos with levels of 454mlu hcg. How far along am i? When is my due date?

It is a . Difficult question because your cycles aren't really adding up the the bhg level? Since u missed the december period, by dates u are over 8 weeks but the number corresponds to about 4 weeks, consistent with the first missed period in january. It doesn't mean there's a problem. In a few days they should be able to see someting on ultrasound but right now it looks, if pregnancy normal about 5 wee.