False labour?

I'm 37+4 and last night about an hour after sex I started getting braxton hicks, then an hour later I started getting really bad pains. Then I fell asleep and woke up 2 hours later in agony! Thought I was going into labour but the pain was constant and couldn't time it so took some tablets and fell back to sleep woke up this morning and the pains are still there. Has this happened to anyone before they went into labour ?