Irregular Period After Baby

Hey guys! So I had my first child, a daughter, ten months ago. I was really sick with HG during my pregnancy and now my periods have been really irregular. I'm currently 18 days late, but I have had no pregnancy symptoms like I did when I was pregnant before. (No, I haven't taken a test yet.) Last time I had my period there were 6 weeks between cycles and before that less time but it was still irregular. Has anyone else had any experience with something like this after giving birth? TIA!