Everyone is totally different when it comes to this subject!
I take after my mother with my metabolism, body shape, weight, and also the fact she never recieved any stretch marks; even after four kids.
I had my daughter four months ago and as far as weight I was back to normal in two months, maybe two and a half months. With hormones I was okay after a month and even then they weren't bad. I would cry because I couldn't pet my beautiful cat as much because I had to hold my daughter so much and it was also a shocker to me getting up many times during the night to feed her and she already knew her days from nights!
Four months later I feel frusterated or stressed at times but I don't think it has to do with my hormones.
I was lucky in the period area.....I blead for two weeks or so after the baby came and four weeks after that I had a normal period and the same four weeks after that and then this month I started my pill again.
Are you going on a BC method? It may help regulate something if not just your period! Everyone is so completely different like I already stated, but you sound normal