Thanks for query,
It seems that you are having viral infection.
As you are having first trimester pregnancy
And as you are getting improvement,take no medicine, if require you may take paracetamol
as and when required.
Pain in lower abdomen is due to stretching of muscles due to coughing and it has no significance.
Take rest and have plenty of water.
If symptoms of cold
worsen then go for medicine after consultation of your Obst.
Ok and bye.,