HI there Nikkijo83
First of all, I am so sorry to hear about your miscarriage and stillbirth.
As for pain low down in your abdomen, yes it is normal to be rather uncomforbale during the last weeks of your pregnancy. I cant remember exactly what pains I had (I think your memories of pain and uncomfies all disapear when you aren't preganant anymore... much like one cant quite remember the pain you were in whilst giving birth once you hold your little one) but I do remember moaning to my Dear Dear Husban about every little pain and ache I had (poor poor man...
If you are worried please remember that you are able to go down to your dr. or hospital at any time for a check... I can only imagine your worry concidering your previous experiances. Just try and relax and stay off your feet as much as possible.
Keep us posted on how you are doing...