Advice needed - Am I in early labour?

I'm a first time mum, so I have no idea what to expect when labour approaches. I have no clue what pains are normal, and not normal. 

I'm 38+6, so I am very close now! This past week I've felt so different in myself as a whole. I've been in such a mood, and have developed night sweats really bad! I literally have to dry myself before going to back to sleep, it's horrible.

The past few days I have felt so rubbish. I've felt weak, so achy all over. Yesterday was my worst, as I was sick when I woke up (which is so unlike me), I had back ache, and could never be comfy. Also, my heartburn hit its peak level... TMI, but I had diarhea loads yesterday.😬 I got these pains covering my belly about 8-10 times yesterday overall, lasting about 5 seconds each. Today I've been very tired, and I was nearly sick again once I woke up. I've had really bad heartburn again. I have the most horrendous back pain on my lower left side. I have a bad headache, and I have slight pains in my lower abdomen sometimes, mainly when I'm moving around slightly. I also feel so tired and weak, I feel like walking is a challenge, and especially because this back pain in so painful. Also, baby has been moving so much more than normal yesterday and today. 

I should add that I have no idea whether I've lost my mucous plug or not. A few days ago, I lost a lot more discharge than normal, but that is just what I looked like... My normal discharge, no blood or anything.

Thank you for reading, any advice would be so appreciated. I feel a bit silly not knowing what is going on with my body, it is such a new experience for me. Xx