No. When objects collide, there is usually a whole region of overlapping pixels, so you can't say a collision happened at only one pixel. Also, the collision algorithm is optimised and uses MMX to check 64 pixels at a time, so even if I tried to retrieve the first overlapping pixel, it would only be to within 64 pixels on the X axis - not particularly useful!
What are you trying to achieve? Usually there is a suitable workaround, such as using trigonometry, or finding the half-way point between the objects, as a good estimate.