Can anyone tell me what will b the consequences . I cannot undo it now. Will it b a problem during adjustment to status or i145 ?

Technically you abandoned your F1 when you used the TPS ead.

Dso has to write this in the sevis .
Approved for more than 20 hours per week of [DSO must insert “on-campus” or “off-campus,” depending upon the type of employment authorization the student already has] employment authorization and reduced course load under the Special Student Relief authorization from [DSO must insert the beginning date of employment] until [DSO must insert the student's program end date, December 24, 2016, or the current EAD expiration date (if the student is currently authorized off-campus employment), whichever date comes first].

The consequences will depending upon how you used your EAD.
1> If you maintained a fulltime F1 then there should be no problem - according to may lawyers.
2 > But, if you didn't had a fulltime F1 status then - almost all lawyers agree that you dropped your F1 are are subject to rules that applies to a TPS holder.

There are some people who will disagree with point #1. But, how the TPS holder (who maintained other status) will be affected, will depend upon the final decision given by federal judge. Furthermore, the DHS, USCIS will negotiate or draft a new rules about a how to handle the situation with existing TPS holder.
For now, it's all uncertain; but there should be a collective voice coming from every one and from every side.
Nepal lost TPS because there is no collective voice from people with Nepali origins.

https://www.federalregister.gov/documents/2015/11/09/2015-28360/employment-authorization-for-nepali-f-1-students-experiencing-severe-economic-hardship-as-a-direct

Ahaa! There you go. It says there is no problem with f1 working. But, reinstatement of f1 if it was dropped is something judge will decide. But. Based on this notice judge's outcome should be favorable to f1s.