heavy moms and BFP

Ashley
If you are considered to be "obsese" and have or are pregnant how long before you got an BFP? my period is 4 days late and at 2 days I got a BFN but I have read that sometime when your over weight (I'm 200 and 5"1) that the hcg can be absorbed by fat cells giving you a negative for a while. Has this happened to anyone?