With DS (who is now 6) I had no symptoms for his whole pregnancy. Minus a BFP, missed period and kicking later on I'd have never known I was pregnant. Just because you have no symptoms its not always bad. Plus symptoms come and go in first trimester.
With this one I did have symptoms, but on her first scan we only saw a sac, then 3 weeks later we saw her and her little heart beating, now she's slowly kicking me. She is a lazy little madam at times. My advice, unless you have bleeding don't worry.