I felt what I'm sure to be implantation cramps while pregnant with my son. i found out at 4. weeks i was pregant.. I had some cramp like pains and I felt weird all the way around. the next day I was still feeling the crampy like feeling and the the nauseous feeling came. once I smelt food I would puke up until about three months. My son is now 7weeks and I am terrified just had my first period after giving birth two weeks ago and had unprotected sex with my fiance once again and he didnt pull out. I started cramping on and off two days ago.. could we have gotten pregnant that quickly?