is this normal cramping for 13 1/2 weeks pregnant?

I am 13 1/2 weeks and am getting this very low abdominal cramps. It's like when I crunch up in a ball or bend down to pick something up. I also felt it somewhat when I was walking up the stairs yesterday. It isn't really painful its just kind of tender. I get the round ligament pains when I get up fast or roll over or something but that seems a little different. Is this maybe also ligament pains or something else? It is also tender if i push on my lower abdomen. Anyone else have this? Thanks!