The worse thing that could happen to Real Madrid is if they drop a point in the Laliga when Barcelona hasn't dropped a point. The league is cool, competitive and interesting as it is now. If there is any to drop points between Barcelona and Real Madrid, it should be Barca to make the league more interesting. When we will know their standings is by next month when European competitions resume.
The point difference between Barcelona and Real Madrid is now only 3. So if Barcelona loses a match and drops points they will also lose the top spot in the points table. On the other hand, if Real Madrid loses points, their points gap with Barcelona will increase. And the title win will be uncertain. So these two teams have to play very carefully in every match and win.
Barcelona leads La Liga by only 3 points ahead of Real Madrid, so I think both Barcelona and Real Madrid have almost the same chance to become champions this season. The point is, whoever can continue to play consistently will have a greater chance. It is not an easy matter for both teams because of the stamina factor and injury problems that are often the scourge after the half season to the end of the season.