I got a lot of cramps and odd 'pulling' sensations with my first pregnancy. I think my body must have remembered from the from the first pregnancy because I didn't experience it second time around.
I would wonder if you might have a bit of a tummy virus or you ate something that disagreed with you if you have fever symptoms as well. Not every symptom you have is pregnancy related, your body is still functioning. But having said that, I was awfully constipated all the way through my pregnancies as well as the constant nausea. Thank god I'm not pregnant anymore!
If you are in doubt you should definately have a chat to your GP, although there isn't much that can do (probably) when you aren't very far along. If you are OK with taking medication while pregnant than plain paracetemol is fine in pregnancy.