How old are you and your boyfriend? How will you take care of this child should you get pregnant? Do you have jobs that provide for the basic shelter, food, clothing, and medical care? Are you willing to give up your dreams and goals for 18 to 20 years without resentment? How will you parent the child you create? IF you answer I don't know or NO to any of these questions, then wait as you are not old enough.
There is a reason to not rush into this as once you do it you can not go back. You are adults whether you are ready for this or not.
Since this is your boyfriend, I would wait until he is your husband of two or three years before I would consider a child. I say this because living with someone is a lot different than dating or having casual sex with them. You get to see the "real" person for the most part and decide if this is what you really signed up for for the long run. Most people take their wedding vows lightly and don't read and understand the "Til death do you part, in sickness and in health and for richer or for poorer." Look at those words and think very deeply about what you are about to do without the marriage license.
Marriage is a full time job of give and take and that means someone gives 100/0, to 50/50, to 35/75 and sometimes more in order to make it work. You put that person before you and your wants and needs and they should do the same for you to make the marriage work. You have to learn to communicate above all else and to be on the same page when it comes to parenting.
I have a daughter who is 35 who would love to have a child but she keeps telling me that she can't do it alone and won't until there is a ring on her finger.
So please think about what I have written and look at it as knowledge and not about bashing your dreams of motherhood. It's about planning and timing and knowing when you are ready for this commitment.
Good luck to you.
The other S.
PS What is the rush?