Cause for concern??

I'll make this short and sweet. 
We believe I am around 6 weeks pregnant. We will find out for sure in two weeks at our first appointment. 
Sometimes I get this weird pressure/pain in my lower pelvic region. Almost feels like I have to poop, like I'm going to have explosive diarrhea. (Graphic I know, I'm sorry, but we all know how it feels) 
I am so anxiety ridden anyways so I'm sure you can imagine how much more anxiety this is giving me. 
I also get random cramps. Not like bend over in pain cramps, but definitely uncomfortable. 
Any advise helps. Am I just being a worry wart? 
Btw...this IS my first pregnancy
Thank you in advance.