Lots of Cramping, what can it mean ?

Jessia • TTC #1 Baby - God’s willing Trying for a few years

I have been cramping for 4 days since I finished ovulation, cramping comes and goes throughout the day. My nipples are extremely sensitive. I have backaches as well. Almost feels like I might be getting my period any minute now but it’s way to early for my period. Could I be pregnant? Is it possible to get symptoms so soon?