Period pains 33+5

I’ve felt ‘off’ all day and my groin is achy but this evening I’ve started getting mild period type pains. They don’t feel like contractions from my first labour and they don’t come and go, it’s like a period ache. I’ve got a hot water bottle and I’m sitting down now which feels better. Any ideas?

P.a definitely not Braxton hicks- I’m VERY familiar with BH