I was cramping just with my implantation bleeding. And just spotting for 2 days on and off after that nun. I didn't get sick with my first either.
I new i was pregnant when i had the implantation bleeding i started having really really sore breast at 3 weeks and i took a test after my missed period then i went to the doc the next day i was 5 weeks preg. I stayed sick up until about 13-14 weeks