Realy dont know what to do or think

Hi every one.

I posted on here a few weeks ago (6 weeks pregnant and need advice). im now 8 +2 weeks. i had my long awaited scan yesterday, only to find that even though they could see a differeance in size from when i went at 6 week and that they could detect a slight heart beat, it wasnt as strong as it should be :[
There fore ive got to prepare for the worse and wait until next friday when they will scan me again and tell me if once and for all what happened to me before (baby stopped growing properly and died at 10 weeks, but didnt know untill my 3 month scan last november) is happening again.
They are fairly confident that if this is the case, it is just 'one' of those things (well two now!), and that they only start testing for problems after its happened the third or fourth time!
The thing is though, i have a little boy already and had no problems conceiving him (though he isnt biologically my husbands).
I then went home last night and was racking my brains as to what may be causing it. i was just trying to look for answers realy.
one thing did cross my mind and I had never thought of this before, and if this wasnt happening for the second time, i proberbly wouldnt be thinking this. but.....my husband, even though he is only in his 30's has since ive known him, and even before i knew him, takes viagra (but the non perscriptive kind) on a regular basis, (for obvious reasons). I had asked him before if he knew what the long term effects for taking this would to do him, though he never investigated it!!
Any way i was on the computer most of last night and discovered that there is a possible link to infertility/slow pregnancies to long term useage of viagra?! can any one give me some of their advice on this? should i believe things that i read on the internet? or am i just clutching at straws to find any answer as to why this keeps happening?! I am going to make an apointment to see my doctor on monday, as i would like to get a second opinion, because the not knowing is the worse feeling ever.

if any one reading this could give me some adivce, id be very gratefull.

Many thanks for reading

from a very stressed mum of one.xxxxxxxxx