No, as I understand it he bombed the clinic during off hours, not expecting anyone to be there.
I thought that, after investigating the Birmingham clinic bombings, authorities determined the two explosions were detonated by remote control. That is to say he was on the scene and aware that the security guard and the nurse were there. The bomb was made of dynamite and nails, so I think that it is a pretty safe bet that he meant to kill people. I remember seeing film of the second explosion on TV, and later hearing that a man in a wig was seen by a few people hiding behind a tree not far from the clinic. In fact that is what led to his being identified.