Just got BFP, but am really bloated?

SO I just got my BFP yesterday. I am just 4 weeks today, so I know I am not like showing or anything silly like that. But I am SUPER bloated, like I had to ware elastic wast pants to work today, even my fat period pants dont feel right. Has anyone had this before? Is this normal? I have been pregnant before but it was 7 years ago, and I don't remember this.