cramps, worried, help please

Er

I'm five and a half weeks and have cramps. They aren't bad, mild cramps and they are more on my left side (which is the same side I had ovulation pain and implantation cramps on). They also are not constant, it starts lasts for a minute or two then goes away for a little and comes back. I am going to call my ob tomorrow for sure. Just wondering if anyone has any idea what is going on or if it's normal ?