life as a mom facing 18 years to life!!! haha

I'm a 26 year old stay at home mother and fiance. I love my life, and love how it has changed. But wow this life is hard. My son is almost 2 and a handle full but he is sooo much fun i love watching him learn and grow into a little man. Any of you other mothers out there feel the pressure to have another baby and the rush of it all. I always hear well you gotta do it soon if your gonna do it, like there is an expiry date on it. You don't want your kids to be to far apart in age but is that really a good reason to have another one right away?