Ectopic Pregnancy

I am currently 5 weeks and 4 days pregnant but I am secretly in fear. I had surgery for an ectopic pregnancy around 3 months ago and I am scared of going through that experience again (first pregnancy) I went to the doctor and they did an ultrasound but were not able to locate the sack. I am currently feeling symptoms of pregnancy at this time but I keep fretting. What if I wake the eight weeks and something bad happens?