Did you order your GCMS notes? At least to know if there is any problem with your application. I know that IRCC is still saying that the processing time is 26 months, even if we all know that it is not true, but you are already in the process for 24 months, so maybe you MP would be able to help. Have you tried contacting him/her?
Open the very first excel file (Permanent and Temporary Resident Applications Overview)
Line 34 gives information about the processing time for inland (domestic) spousal sponsorship. You will see that at the end of the 3rd trimester (Sept 2016), the processing time was 23 months (even if IRCC continously mention 26 months). These are official statistics. Unfortunately, stats for the 4th trimester have not been released yet.
If you contact your MP, I would suggest you to print that file and ask if he/she can put some pressure on IRCC to make them process your file as you are 24 months in the process and official stats show that the normal processing time was 23 months in Sept 2016.
In any case, best of luck with the process!
Congratulations for the pregnancy and although easier said than done, don't let the immigration process affect you and your husband. In the end, it will be approved.