Braxton Hicks

So this evening I just started getting Braxton Hicks as I normally would around this time, but now I’m a little scared. The tightening normally lasts only up to a minute or so and then I feel some relief but my stomach and lower abdomen have been tightened for like 3 minutes at a time. Then I’ll get about a minute or two of relief and the tightening returns. It’s been going on for the past hr. I’ve sat down, drank water everything recommended. Has this happened to anyone? I’m 33 weeks by the way