All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.
Hajj and 'Umrah are two obligations that must be performed immediately (i.e., whenever the person fulfills the conditions of performing them). Therefore, this person should hasten to go for Hajj and 'Umrah whenever he is capable. What is mentioned is not an excuse for him to delay Hajj and ‘Umrah.
If he is sure that he has discharged such drops, then he must perform ablution; otherwise, he does not have to check whether or not he did.
It is sufficient for him to act according to the principle that he has not discharged anything. But if he becomes absolutely certain that he had any discharges, then in this case, he should perform ablution.
In case he has continuous discharges in a way that he does not find a time to perform the prayer with correct purity, then he is suffering from incontinence of urine. Hence, he performs ablution for the prayer after its time has started, and prays with this ablution both the obligatory and supererogatory prayers he wishes to perform until the time of that prayer ends. It is not difficult to do so in the Haram (Ka’bah in Makkah), Allah willing. Yet, if this becomes difficult for him to do, then he may act according to the Maaliki School of jurisprudence who do not consider that it is an obligation to perform ablution for every prayer (for a person in that condition).
For more benefit, please refer to Fataawa 358042, 365380, 339553 and 100572.
Allah knows best.