This is strange...should I be worried?

This is my 3rd pregnancy and I will be 5 weeks in 2 days and having little to no pregnancy symptoms. To me this is a little strange I mean I didn't even have symptoms before I tested positive the only thing that prompted me to test was because I thought it was going to be a BFN so I wanted to test early and get it over with but then AF never showed. With my 1st I had symptoms starting at 3 weeks a little after I found out and horrible morning sickness at 5 weeks along with moodiness and hunger and with my 2nd I remember having symptoms but chalked it up to being on birth control since I didn't officially find out I was pregnant until around 12 weeks but this time it is a little weird no sickness, insomnia INSTEAD of fatigue and my moods are fine...should I be worried?