Pregnant right after miscarriage

Was preparing myself to hear it was another miscarriage because my beta numbers only went up by 961 between the two test .. 1st beta test 49827 & 2nd beta test 3 days later was 50788 and they wasn’t thinking the pregnancy was viable because that and I was scared because of my previous miscarriage which was in October 17 ended up having d&c on Nov 25 because a small bit of tissue was left only to find out at the appointment I’m 9weeks 3 days (Friday) when we all was thinking I was around 5-6 weeks.She said everything is perfect baby is perfect Heart-rate

is 179. In shock because I was told I have to have a cycle after miscarriage and I didn’t so I didn’t think it was even possible to get pregnant.