Help please , cramps !

Brittany • Christian Mother , & wife ,baby number two Due march 27th??
I just found out I was pregnant , yesterday so every ache I feel is alarming . I'll be seven weeks tomorrow .. However I'm still nursing and when I nurse I get this burning feeling in my lower abdomen . It's worrying me , even though I think it's probably normal. Any advice ? I'm not sure if it's directly related to nursing or just my body changing ... Any one else experiencing this ?