Changes in body

Okay so it's been a week or so since I had sex, I've not had any symptoms and my period is due next week.

Normally a few days before I start I bloat up, and when I have orgasms I get minor cramping for a few minutes after (not sure why).

Now I know I am not due to start for a week and today I'm bloated, and I've been cramping up a bit after orgasms. Is this a sign or could it just be stress? Please help me just a little confused this is unlike my body