welcome to HealthcareMagic
The medicines you are taking are for allergy
& breathlessness.Since you are pregnant if these medicines are not to be continued for long say if you are going to take it for 1 week or so then its fine but still better to consult a Gynaec.As far as the drugs are concerned :-
does cross placental barrier so it can be used only when it is necessary & cannot be substituted.
As for Telecast-L it has 2 drugs together Montelukast
which is again like deriphyllin & has to be used with caution & only if required.The other part is L for Levocetrizine ;it is a antihistaminic it sometimes causes sedation but can be used in pregnancy
The best thing is to consult the treating doctor & tell him about pregnancy he will advise regarding how long to be taken ;also better follow it up with your Gynaecologist.