How did you know you were in labor?

I know every labor is different, however, I would like to hear a couple stories about how you knew. I know the contractions really give it away (lol), but I am currently 33 weeks and 6 days and I have had period like cramps throughout the day. I am feeling a weird burning/stinging on my cervix. No infections or anything. Just wondering if it is too early for me to be dilating? I do not get pelvic checks until 36 weeks so that will be my appointment in 2 weeks. Just feeling sore and crampy and very heavy. As everyone does. But I'd like to hear from real women and not random articles that come up on google the things that I should look out for and tell my doctor about. I am not at all concerned that I am in labor. Just want to know what to look out for besides the "you'll know" response.