BH vs Real Contractions?

I’m familiar with the feeling of Braxton Hicks but not real labor contractions. I get BH every night so I’m used to them. However pretty much all of today has been a very ‘different’ feeling. Instead of the normal tightness I feel all over my belly that you’d get with BH, I’ve only had a dull ache and period like cramps down below in my pelvic region. Really feels like I’m gonna start my period which feels different than BH. I’m concerned though because I’m only 34+5 and due in January. Is this a sign of preterm labor or that labor is near?

I do have an OB appointment in 2 days so I’m going to bring it up to my OB if this doesn’t go away. I would just like to know if this is a warning sign or if this is normal and I shouldn’t worry so much.