Stopped taking birth control and got pregnant before my first period off the pill. i had light pink spotting at 5w 5d. are my ultrasounds accurate?

Yes: Early pregnancy ultrasounds should be very accurate at defining the due date. Of course, due dates are still just estimates. Deliveries usually occur between 2 weeks before and 2 weeks after the due date.

In short - Yes: Us dating between 8-13 weeks is the most accurate to within +/- 3-4 days. It is possible the dating by last menses may be incorrect as well, especially if menses are variable. Since your us was earlier, consider another at 8-13 weeks to confirm interval growth and dating, if there is any concern or questions about the due date. Please discuss any questions with your docto.