Hey all...Im hoping someone out there can help me...for the past 3 months my periods have been weird...it changed from a 28 day period to a 34 day period then to a 31 day period...My last period was Dec 29 2007 and i was due for my next one Jan 29. It is now Feb 25 and I have took 6 test and all are neg....Could i still be pregnant? I have a few symptons such as the sore breasts and im tired all the time...but i also know that is a sign of your period...I guess my question is How long until a hpt shows up positive? and has this happened to anyone else?