Midwife Nikki Khan says: You will be much more sensitive to heat now you're pregnant. As you're in your third trimester, breathlessness and fainting can become more exaggerated due to the increasing size of your uterus. Your metabolism will have increased, making you feel warmer than normal, so it's important to say cool and drink plenty of fluids. Pregnancy hormones can contribute to the flushes you've been experiencing. Swollen feet can also be due to the heat and not resting enough. However, if the selling is excessive, see you midwife and get your blood pressure and urine checked, too. There is a more serious condition called pre-eclampsia, the symptoms of which include swelling, as well as high blood pressure and protein in the urine. It's a good idea to see your midwife anyway, just to make sure all is well.