thank you so much for your prompt response. it really helped me chill out and get through my day.
This is your period, not breakthough bleeding. Breakthrough bleeding is when you are taking the pill and have some spotting/bleeding when you're not supposed to.
Yes, you can start a fresh new pack of pills on the Sunday after you started this period.
In this case, with you planning to start another pack of pills, sex during your period and withdrawing will not result in pg. I'm sure you're fine. It'd take POSSIBLE sperm in the precum, and long-living sperm at that, along with an early ovulation to get pg. But since you are planning to start a new pack on Sunday then you won't ovulate, so you'll be fine.