Miscarried in August... but missed my period this month

So I'm a first time poster. I downloaded this app after my miscarriage in August to read some of y'alls stories so I didn't feel so alone. It's helped me so much. So in August I miscarried at 11 weeks. I was devastated... even though it wasn't my first miscarriage. I have two healthy children (14 and 7) but I've had several miscarriages. My OB wanted me to have a regular period before starting me on a new birth control. In September I had a regular period and I was scheduled to go in October to be put on birth control when I got my period which I was supposed to get October 4th... well I'm late. I took two tests and they're both positive... I'm so scared.