Third miscarriage

Renee • Mommy to two girls, Naomi and Raven who are 11 years apart.
I'm supposed to be 7w3d but today after sex I started bleeding, a lot. At exactly 6 weeks I started having brown spotting and the doctor said "not to worry". I knew better. My first miscarriage happened last September. This is 3 miscarriages in less than a year now. I just feel like giving up. I didn't even make it to the 8 week ultrasound check up this time.