First real contraction

Mi

So I started getting Braxton Hicks about a week ago and they weren't too bad mostly just felt like his butt was stick it out but I thought a contraction would be for some more intense feeling of that. Until this morning I just had my first real one radiating back pain whole entire stomach tightening extreme pain had to breathe through it that was horrible and now I'm officially terrified drink some water hoping I don't get another one I'm only 36 weeks