I am a little over 4 weeks pregnant, and I had a little spotting this morning. But I have also had some constipation problems. Could the constipation be part of the reason I was spotting? I am very concerned here. Please help.

No reason to be concerned just by spotting.
Spotting is common enough.
Constipation is unrelated to spotting.
I suppose if you are straining your muscles to go, and you were going to spot anyway, they might coincide, but straining doesn't 'cause' a miscarriage if that's what you were wondering.