Hi there.
Although it is worrying try not to stress, especially if you have no cramping/bleeding. Personally I had NO symptoms in my 1st trimester, which I also worried about, but 12 wk scan showed all ok. I seem to suffer more in the 2nd tri with headaches and dizziness- we are all different and our bodies react differently. An early scan might be good idea if you keep worrying though just to set you at ease.