Preterm labour???????

Hi I’m 30 weeks and 5 days and since I woke up this morning I’ve been having uncomfortable mild period like pain and I’ve had this discomfort pretty much all day and I’ve gone to the toilet a lot of times although I’m a bit constipated. Anyway it’s now 9pm and I’m lying in bed and I noticed the pain was coming and going (it seemed to be quite consistent all day instead of coming and going) so I tried a contraction timer app and this is what it looks like so far

The pain is quite mild but noticeable enough that I can time it. Should I be worried?? What is happening?? Is it braxton hicks??