1) Be pregnant 2) Be pregnant with 3) Carry a fetus 4) Carry before birth 5) Carry in the womb 6) Carry until delivery 7) Conceive 8) Conceptualise 9) Conceptualize 10) Create by mental act 11) Create mentally 12) Develop 13) Develop an idea 14) Develop gradually 15) Develop slowly 16) Have a bun in the oven 1) Conceive 2) Conceptualise 3) Conceptualize 4) Preconceive 
To carry and maintain one or more young within the uterus from the time they are zygotes until they are ready to be born. ... (09 Oct 1997) ... 
[v] - have the idea for
conceptualize verb have the idea for; `He conceived of a robot that would help paralyzed patients`; `This library was well conceived`
have the idea for[Intelligent words] have the idea for