The main reason why you may not have heard anything about DM yet is because of the medicals. I believe that they only start processing second stage DM when they have all the documents they need. So they only started processing your second stage January 23rd. You will probably hear around the same time my husband and I do - hopefully. It looks like the last few DMs that were given were given out after 19 - 23 days. We may hear as soon as this Tuesday (the 11th).
Keep your chin up, I believe that CBSA may have jumped the gun a little bit in your husband's case. There was no reason to put him under a subject of removal if he was checking in every month as was requested without issue - which seems to be the case. If he's in process for spousal sponsorship, he is in the process of getting a status. Correct me if I'm wrong, but your husband was already out of status when you applied for spousal sponsorship, correct? If this is the case, he would not have entered into implied status when you filed for the sponsorship - this is probably the issue.
Trust me, googling or looking up online what happens or what this means is just about the worst thing you can do to your nerves. I'm the same way - google turned a cough into cancer when I looked it up.
Everything will be okay. You have both made it this far and the process is nearly done. Are you reporting to the same office that you've been reporting to every month when you will bring this issue up?