Do you normally have irregullar cycles? Also, you can still get a BFN on 18 DPO depending on the test you use and how your HCG levels are growing. So, do you know for sure you are 20 dpo right now? Are you going to test again? Try First response, they detect 40 mIU of hcg, one of the lowest levels out there (some go down to 25) and even if the line is super faint, it could be a positive. Keep us posted!
DH, John (36)
Max, 1/20/03, 25 wks, 1lb. 3ozs. (IUGR), severe PE
#2 is on the way, EDD 4/18/05 (seems so far away!)