I've had evil phlegm glued to the back of my throat ever since I became pregnant (about 4 months ago). It's very thick and green and difficult to bring up, often makes me retch when I try to cough it up. I often have problems with catarrh in winter but it usually goes after about 3 weeks. This just seems to be going on forever and is really unpleasant. Could it be linked to pregnancy? Is there anything I can take for it that is OK during pregnancy?