Pregnancy soon after having a baby?

Alyson • I`m a 21 year old mother to a 5 month old baby boy and currently 1-2 weeks pregnant (:
I had my son 2 months ago and haven't picked a birth control yet. My boyfriend and I are very sexually active and we haven't been taking any precautions. Is there anyone that got pregnant soon after having a baby and are making out to be fine. How is everything and how is your experiences?