Holding my breath, got a positive, mixed emotions, how often should I retest? Advice?

Kat

Beautiful LO born May 2017

Very early miscarriage chemical pregnancy September 2018

Got positive in 9 DPO evening (felt nausea)

Looked still positive 10 DPO, darker 12 dpo, same 13 DPO.

I am having ptsd of chemical where I think line is going to fade and I’m going to go to the bathroom and see blood. Of course also super grateful and excited and optimistic but trying not to let my mom mind run wild of where to put crib and October birthday parties etc!!

How often should I retest?

First doctor appt at 8 weeks right?

Any other advice or reassurance that chance of second miscarriage is so low?

Thank you all!