Express Delivery/Playing With

Basic Trope: A pregnancy that begins and ends very quickly.
Played Straight: Alice is pregnant at the start of one season of As The Earth Orbits, and gives birth next season.
Exaggerated: Alice's baby is born within the next couple of episodes.
Downplayed: Alice's pregnancy last 5-7 months.
Justified:
- There is only so much time in which to portray events in a storyline.
- The actress that plays Alice is pregnant, and so a storyline involving the pregnancy is shoehorned in.
- Alice is not human, and her species (whatever it may be) has a fast pregnancy.
- The storyline involves Alice having a miscarriage or abortion early in the pregnancy.
- The timeline is personal rather than calender, so what was 2 months was actually 9 months gone by fast.
Inverted: Alice is pregnant for several seasons straight.
Subverted: Alice's pregnancy takes the usual 9 months in the series
Double Subverted: 9 months of "storyline time" that is. The episodes were filmed according to filming time, or made use of a flash forward.
Deconstructed: It destroys the audience's Willing Suspension of Disbelief; most people know that a pregnancy does not normally go that quickly. (If it does, chances are it's because of a miscarriage or abortion.)
Reconstructed: The timeline makes it clear that it's a realistic amount of time.
Parodied: Alice is visibly and heavily pregnant as soon as she's done having sex with Bob, and gives birth the morning after.
Zig Zagged: Some pregnancies go fast, others slow, and others at a realistic speed.
Lampshaded: "Didn't you just take a pregnancy test yesterday?"
Averted:
- Alice's pregnancy lasts for a normal amount of time.
- Alice's pregnancy is the Longest Pregnancy Ever
- Alice does not become pregnant in-series.
Enforced:
- "We need to portray a pregnancy without taking forever to film it."
- "The actress that plays Alice is pregnant, and we can't hide it at this point; let's make it part of the storyline."
Invoked: Alice, frustrated with the uncomfortable aspects of pregnancy, seeks the help of a witch, who gives her a potion that will speed up her pregnancy.
Defied: Alice has second thoughts about taking the potion, fearing that it could hurt the baby (or her), and decides to just suck it up and deal with her discomfort.
Discussed: "It seems like just yesterday, Alice was just starting to show."
Conversed: "That was just yesterday!"
Played For Laughs: Gilligan Cut
Played For Drama: The baby's early arrival causes problems and/or it doesn't survive.

You had the baby already? Didn't you just tell me about two weeks ago?