What some women find helpful for nose bleeds colds and sinus
The skin lining the inside of the nose is very fine and fragile. During pregnancy the hormone 'progesterone' makes the tiny blood vessels (or 'capillaries') in the nasal skin relax, dilate and become 'fuller'. This, combined with the amount of blood circulating in the woman's body increasing by up 50%, tends to make a pregnant woman's nose produce more mucous and be more likely to bleed.
The results of these physical changes can also mean that you experience a constantly blocked (or runny) nose, and/or sudden nose bleeds. Many women also find that they tend to suffer from more allergy and/or sinus problems and colds are more difficult to recover from.
Pregnancy can also make your sense of smell become very strong (or more sensitive). This usually means that smells start to become more noticeable, and in some cases make you feel nauseated and/or actually vomit! It may be that odours you previously tolerated (such as bacon cooking, garlic on a partner's breath, your friends' perfume or the smoke from a cigarette) will now make you physically ill. Your 'sensitive sense of smell' should return to normal after the birth.