2nd pregnancy

I found out last week that I am pregnant again 💙, however I am very nourvous as my 1st pregnancy my baby was born sleeping. I am 5 weeks and 5 days, I have no symptoms, I had a few days where I felt a little naucious, had slight lower back ache and very fatigued, however these symptoms have faded and that is worrying me. Also with my 1st pregnancy by breast had swollen so much by now, this time nothing. Has anyone experienced anything like this and everything was OK?? I am so worried all the time and I need some reassurance.