Your question is extremely confusing - you have not described exactly what your problem is. It is not clear why (or even whether) you continuously feel the need to spit, and whether this is something that you have been experiencing only since the start of your pregnancy. Do you suffer from a chronic cough or some other kind of irritation of the throat, due to which you constantly need to clear your throat of phlegm? It is unlikely that any of these problems could be actually caused by or related to your pregnancy in any way, but experiencing them during your pregnancy does mean that the solutions available to you are limited. Many drugs and even some home remedies are not advisable for expecting and nursing mothers. In addition, it is probably more of a bother than it would normally be, since you already have plenty to deal with during your pregnancy, without the added irritation of a cough or an itchy throat.
The possible causes of your condition are many - it is particularly difficult to diagnose the problem because you have not provided much information. In any case, you should consult your doctor, as he or she will be able to suggest an appropriate course of action after thoroughly exploring your symptoms and taking into consideration the specifics of your health during your pregnancy.
One possibility is that you have recently developed an allergy or at least a heightened sensitivity to some substance in your environment. A woman's body undergoes many changes during pregnancy, and sometimes you may become more allergic, or often on the other hand even less allergic, to certain substances. If you can determine what exactly is causing the itchiness and the constant urge to clear your throat and spit, you can try to eliminate the substance from your home and environment.
Acid reflux could also cause irritation of the throat, as well as more permanent damage. It is therefore important to detect this problem as soon as possible. If you also suffer from heartburn after your meals, then it is quite likely that you are suffering from acid reflux. On the other hand, you could be suffering from a minor but extremely irritating problem called postnasal drip, in which the sinuses produce too much mucus, which then accumulates at the back of the throat, causing irritation. This is sometimes due to allergies, but it can also have other causes.
answered by M W