Current projections suggests that the senate will go from 51-48-1 to 50-49-1 (the 1 is Bernie Sanders, who's independent but very liberal) and the house will flip to Democratic control (quite possibly giving an advantage in the low double-digits). However, with so many close races and a month and a half before the election, it's anyone's game for control of the Senate.
This year there's a potential for voting surges among young white liberals (who rarely vote) and black women (a large portion of whom don't vote because they live in places where democrats have largely ceded control to republicans). Potential voting surges often fail to materialize to any useful degree because of voting barriers or complacency, but if both of them happen to pan out, it has the potential to go something like 46-53-1 in the senate, and an advantage of around +25 votes in the house... an outside chance at this point, but who knows what will happen until then.
There's like, one "pro-Trump Dem" - Joe Manchin, who nevertheless votes with other dems when there's a call for full-party resistance. I'd be surprised if any more got elected.