I got a cold/flu no long too - I am now 19 weeks pregnant and I got better by doing steam inhalations with salty water to clear my blocked nose, drinking lots and lots of lemon tea (lemon peel in warm water) with honey and at the end, to help with the dry cough, I bought a humidifier and that did wonders too for my breathing. It lasted about 3 weeks and I still occasionaly snotty but feeling much better now. I read everything about colds and flu in pregnancy and I think that Olbas oil was not recommended as well as eucalyptus oil because they are descongestant oils and should not be used in pregnancy. Salt is as good to help clear the mucus and is antiseptic too, you can inhale to clear the nose and gargle with warm salty water to clear the throat. And rest, I stayed in bed for 2 days, sleeping and reading and that helped too... Good luck!