Need help! 😩

So I’m a FTM and 30 weeks pregnant...I’ve been experiencing these period like pains that go from mild to severe. I have this constant headache..and when I walk there is so much pressure at times. My son has been head down since I was 20 weeks. I don’t know what these pains are..are they contractions, Braxton Hicks, gas, or just normal pregnancy symptoms?