I had my first u/s at 5 weeks and it showed a heart rate of 86Bpm. I was supposed to go back and have another u/s but i didn't worry about it because I was told the low heart rate could be due to early pregnancy. It is now 2 weeks on and i'm reading other peoples stories of misscarraging on the internet and i'm a bit worried, i'm still experiencing all the signs of being pregnant - morning sickness, nausia and tiredness. Should I be worried?