Very Long story short,
I'm 24 married and have PCOS (polycystic ovarian syndrome)
I live in the UK
I had a misscarige July 2008 at 8 weeks, with that pregnancy I had very bad morning sickness all through the day starting a week after my missed period and after the misscarige
Me and hubby have decided to try again
I am now 4 days late, athough my periods have become more irregular from the PCOS
I had a negative test this morning
I have no symptoms of pregnancy or period (as they are similar)
I normally get cramps before my period
Is anyone in the same boat or something similar?
We have been trying for 7 months but between I have had a laparascopy to diagnose my PCOS,
Would love any advice:)

The HPT's are all different. Did you try just one and only one brand? I'd recommend trying a different brand two days from now. The hCG hormone that is detected by the HPT doubles every 24hrs. And in some women the hormone is not very strong during early stages of pregnancy.
I'm in a similar boat right now. I have endometriosis and we've been trying to conceive for over a year now. Only over the past 2 weeks I have been experiencing some signs of pregnancy, but had two negative HPT's when I took them 5 and 3 days before my missed period. I suppose I'm just impatient, haha.

Try that though, and if you really want to be sure, just go to your doctor. They can detect 5mUI/hCG in a urin test compared to the usual 25mUI/hCG or 100mUI/hcg like reg HPT's.