Implantation symptoms?

Nauseous on and off

Cramps . it feels like my whole stomach is contracting sometimes

Bloated

Headache today which I normally don’t get, only time I do is when I’m very stressed or when I was pregnant before

Period due in 9 days

According to my app ovulated on Dec 31st

Or just pms?

Stopped birth control 2 weeks ago due to mood swings. Not trying nor preventing to get pregnant as my SO and I use the pull out method which isn’t very effective all the time.

We have 2 children already