4 weeks and cramping

I just found out I'm pregnant and I'm about 4 weeks. I've been having really bad cramps for the past 3-4 days. I don't know if maybe it's a combination or regular cramps and/or constipation cramps. I am going to schedule an appointment with my dr but I wanted to know if anyone has experienced this before? I really hope it's nothing bad. Let me know please & thank you!