Should I be concerned? (Long, I'm sorry!)

Alright, so I'm 31 weeks exactly as of today. This is my very first pregnancy. Last week I peed and noticed more discharge than usual and noticed that it was a light yellowish color. It didn't have a weird smell or anything unusual other than the color. I assumed this was my mucous plug as I've read so many times you can lose it and it will regenerate. Well that night I had some crampiness/pain in my lower back, but took some Tylenol and a warm bath and went to bed. I've had some dull pains here and there since then but nothing more. Last night, I felt as if my baby was moving lower than usual and it was slightly painful but I just went to bed assuming it was normal pregnancy stuff. Today around noon I got them again except they were also in my lower pelvic area. I sat down for a bit just to take a breather as he was also repositioning himself and it was not the most comfortable feeling ever. When I stood back up it was difficult to stand and start walking and felt I had more pressure down low. I then drank water, laid down and rested for a bit. The pains subsided but through it all I felt nauseated and dizzy, also had no appetite. I chalked it up to not having lunch as I realized I didn't eat lunch and had myself a VERY small supper because I started feeling more nauseous and still dizzy. I'm hurting in my lower back again and just fee super uncomfortable. Is all of this normal or is it something I should be concerned about? I talked to my mom about it earlier and she didn't act like I should be concerned but, I just wanted to ask others as well. Thanks guys.