Why am i so emotional!?😠😢

I'm a first time mum and I'm currently 33 weeks pregnant..I've had the odd time being emotional but recently like today I feel extremely irritated and angry! I have a lump in my throat like I want to burst into tears, I'm even getting irritated by certain noises or anyone speaking to me! I have felt different the past few days with a lot more movement from baby, I've been getting sharp pains in my pelvis. Is my body getting ready for labor?