Rachey: it's actually far far better that your asthma is correctly controlled while pregnant and the inhaled steroids are miniscule doses (because they get taken right to the point of need) and have a good safety record. There's some excellent information at Asthma UK - in particular the Asthma and Women document. I'll copy and paste the relevant bit:
Asthma during pregnancy
So many hormonal changes take place during pregnancy, that it is hardly surprising many women report changes in their asthma too.
For most women with asthma, there is every chance that their pregnancy will be trouble-free. But many women do have concerns at this important time in their lives. Here are the answers to some common questions about asthma in pregnancy.
Will my asthma get worse during pregnancy?
Like pregnancy itself, asthma varies enormously from woman to woman. Around one third of women find their asthma symptoms improve in pregnancy, one third stay the same and one third find their asthma gets worse. If your asthma gets worse, you may need to increase your medication.
Can my asthma treatment harm my baby?
No. Your baby will do best if you are breathing well and easily, so it is important that your asthma is well controlled.
Most asthma medicines are inhaled. These are entirely safe for your baby.
There are two types of asthma treatment:
Relievers
- Relievers help prevent breathing difficulties when they happen. Relievers (eg Ventolin, Bricanyl) are perfectly safe to use during pregnancy.
Preventers
-
Preventers help protect the airways. They make asthma symptoms less likely.
-
Preventers usually contain an inhaled steroid. Many people worry about the effects of steroids. Inhaled steroids (eg Becotide, Flixotide and Pulmicort) go straight down to the airways where they are needed, so very little is absorbed into the bloodstream. This means the medicine is highly unlikely to reach the baby. If high doses of inhaled steroids are used, it is sensible to use a spacer device to reduce the risk of absorption.
-
For full details of asthma treatments, see our booklet Take Control of Asthma.
Steroid tablets
-
Very rarely more severe asthma in pregnancy needs treating with steroid tablets. Short courses for 1-2 weeks can do no harm to your baby.
-
A very small minority of people with severe asthma need to take steroid tablets for a longer period. Using steroid tablets for long periods of time or repeatedly during pregnancy can increase the risk of your baby being born underweight. In severe long-term asthma you and your doctor will have weighed up the risks against the benefits of using steroid tablets to control your asthma.
-
For more information about steroids, see our booklet Steroids for Asthma.
Other medicines
-
Chest infections may occasionally need to be treated with antibiotics. Commonly used antibiotics, such as amoxycillin, are safe. Others, such as tetracycline, are not used in pregnancy.
-
If you are worried, discuss your treatment with your doctor or practice nurse.