In this episode, it raised a potential problem for Lois and Clark: They forgot to use birth control, aka "precautions," when they made love because they were in a rushed frenzy on their kitchen floor while Lois was supposed to be cooking breakfast. Their realization that Lois could get pregnant from not using precautions led them to ponder whether they wanted children or not.
The scene with the babydolls was Lois' nightmare/daydream of what life would be like if she was a mother -- trying to interview the Queen and other famous people while juggling screaming babies and a husband that kept leaving.
The car scene was where Lois and Clark talked about having tests run with Dr. Klein to find out if they even could have children. Although they hadn't decided if they even wanted to, they wanted to know if they even should be thinking about it. After all, if a Kryptonian and a human aren't biologically compatible, than it would be a moot point. Lois admitted in this scene that it's "scary" to think that they may not be able to have babies together, to which Clark sweetly replied, "Maybe we'll have super babies."
The bedroom scene was at the end of the episode. They were getting intimate and Lois quickly remembered they needed to use birth control and rolled off of Clark (where she had been doing some heavy making out on top of him) and reached toward her nightstand, and then the scene faded out.
I hope that helps in some ways! I always thought this was an interesting episode.
Clark: "You like to be on top. Got it."
Lois: "Don't push me, Kent. You are way out of your league."