THAT"S SHOCKING

So I know this is a super random post that most people wouldn't mention but I was absolutely shocked!
I am going to tell you about my yearly womens checkup. I went to the Dr's on Wednesday and while they were ...down there the Dr. said "this is strange, your Cervix is dialated, lets do an ultrasound." I was thinking an ultrasound for what? Well when the picture came up, I was immediately SHOCKED!!! There is a baby in my tummy! and not just a little gummy bear baby that you usually see the first ultrasound. This was a real baby with a big head, a spine, a tummy, toes, fingers, arms, facial features and a heart. I am pregnant...again! Due August 2nd. That means I am nearly eighteen weeks.
I'm not stupid, I had realized that I hadn't started my period since I stopped breastfeeding. I called the doctor in January and they said it was normal to not start your period for a while. Then Last week I felt really crampy and kindof gassy (apparently that was the baby moving) and like my round ligaments were stretching, but didn't really believe I was pregnant and especially not half way done!
Anyways, we are very excited, nervous and proud to be parents again. If anyone knows anyone as fertile as I am, I mean getting pregnant while breastfeeding and on birth control, please let me know. I would love to know what their preventative measures are!