Is this labor starting? How much longer do you think I have?

So I’ve been getting contractions since last night they weren’t really painful just more so uncomfortable they where coming and going pretty often but weren’t consistent and then they stopped. I then started to get a few more later last night and decided to try to sleep through them so I fell asleep and woke up in the morning just really sore in my lower abdomen and back and was also getting a few contractions and they where a little bit more painful but again still not consistent. I got them throughout the whole morning and they stopped again for about an hour or two and then restarted. At around 2 i lost what I’m almost positive is a piece of my mucus plug (it was clear and stretchy) and around 3:30 I decided to lay down and take a nap. I woke up just now from the nap with some pretty bad stomach pains and some cramps in my lower back and abdomen and I’m now having diarrhea. Is this labor coming in so confused because the contractions have not been very consistent they’ll come and then stop. I’m 38 weeks and the last time it’s checked was yesterday morning and i was at a .5