Cramps, normal...?

Hi everyone! My husband and I were trying for our first for, literally, a month and were surprised to find out it only took one month! We got our positive test earlier this week and are presumed to be around 5 weeks along with a 9 week doctor appointment 10/17. One of the biggest reasons I was so shocked to get a positive test (or positive multiple tests lol) was because I was having off and on cramping in the days before as well as now, thinking my period was coming. It comes and goes and literally feels like period cramps. Sometimes it hurts pretty bad and sometimes it's just an annoying sensation, but comes and goes and doesn't really last too long. Is this normal? This is our first pregnancy so I'm very new to this. Any input is great! Thanks ladies!!