Dear Rubab11,
What is your husband status in Canada i.e on work permit, student or immigrant?
What docs u were attached last year?
In fact, there are very minor ratios of professional people who get TRV from Pakistan. Many cases reject on such basis that u will not leave Canada at the end of your stay or poor travel history and insufficient funding. As ur husband is already in Canada therefore i think VO (Visa Officer) was rejected ur case upon thinking that u will not leave Canada. It means ur ties are not strong with your home country in such scenario.
Therefore i think you should follow the below mentioned plan if you can:
According to my point of view, ur case is strong as u r working a full time professional job. I will advise you that find and register a medical conference (relevant to your field) in Canada and then apply for TRV with multiple entries. Also remember, attach all your official letters i.e approved leave plan, Work employment letter (Salary and other benefits should be written), your employment status, invitation letter from conference organizer etc along ur case. It will be more helpful for your visa if u get any medical training/workshop certificate from Pakistan also.
Inshallah your chances of getting visa are high. If you need further assistance, let me know on this forum. Thanks
Regards
Waqar Ahmad
(Canada TRV Approved)