Nausea at 27 weeks

Im 27+4 and for last 3 days the nausea has come back. Feelimg sick but not actually sick and im loosing appetite again. :( with my son i had nausea dor 2 weeks about 10 weeks pregnant. Now carrying my daughter ive had more feelimg rubbish days. Just moaning and the heat and having to work in childcare isnt helping