Pregnant again.

Well I was supposed to go to the doctors and get put on birth control on the 22nd of last month. Well something didn’t seem right. I had 2 cycles in February the 8th and the 21st. This was my first cycle after giving birth in December 2017. Well I was thinking to myself if I was to go based off my first cycle I should have gotten my cycle and it’s now March 15th. I was at work at the time and had to run to the store and grab a test. Well it was positive!!! I’m so scared I just had my son December 19th. What gets me is if I go based off my first cycle I would be 8 weeks today. And if I went with the 21st I’d be 6 weeks. I had an ultrasound today and I’m 7weeks 2 days. I’m so confused my body must have been so screwed up. I’m due November 20th 2018. My son will not even be a year old yet. I’m so so scared but I know I have been blessed.