I think any evidence of gainfull employment, and the ability to support both himself & you will be advantageous.
Possibly the (employment) covering letter should include all his job history.
Pregnant.... firstly my congratulations.
The pregnancy in itself is not going to sway the decision of the Embassy, but if your case is strong, it might push them to award the visa quicker.
I'd suggest that in the covering letter from your husband, apart from mentioning how you meet, when was the marriage etc etc , he also mentions that you are pregnant, you're both missing each other, and he wants to be there at the birth etc etc .... and attach the doctor's certificate to that covering letter. It can't do any harm.
Good luck ..... and I expect a drink at Jack's Ridge next time I'm in Davao !