Is it true that some miscarriages can happen from having pregnancies too close together?

I got pregnant when my son was 7 months and miscarried at 7 weeks then I got pregnant again about 2 1/2 months later and miscarried again at 9 weeks

Yes. I Got Pregnant About A Week After My Daughter Turned 2 Months Old And Had A Miscarriage A Month Into The Pregnancy. My OB Told Me It Was Because I Got Pregnant Again So Soon And My Cervix Hadn't Had Time To Go Back To Normal Yet So My Body Wasn't Ready For Another Pregnancy Yet. @mommytimestwo

I've never heard of that before 😮