it could be braxton hicks and you can get nausea and sickness anytime in pregnancy also you can have more discharge too. i am now 38 weeks and get BH all the time, i sometimes feel sick after i eat and i have more discharge than i did earlier on. But if you are worried then call your midwife or delivery suite, they will probably ask you to go in and be checked just to be sure, i am sure it will be fine.
with BH its best to sit down and try to relax and breathe deeply, it makes it more comfortable.