Cramps and spotting

Cramps are normal during pregnancy right? With my first my periods were not regular so I did not know I was pregnant until I was about 4 months along. I had no symptoms at all. I don't remember cramping then. With this pregnancy everything was regular and I knew I was pregnant before I missed a period. I've been cramping today not too bad but they just hit out of no where and have had some spotting.  I'm exstremly tired and don't feel up to doing anything. This is all normal right???