Anyone experienced or experiencing this?

This is my second baby my first born is 14mons now.

I’ve noticed im having a lot of discharge ever since second trimester it was clear white then on my 30 weeks i had some brown discharge it was alot so I called my OB and check me out right away.

she requested to do blood test, pelvic ultrasound to know my cervix is 1.9cm and sonographer told me it’s low. Last month i was 3.5 cm so im so scared 😟

I’m still having on and off mucus with tinge of blood. I’m scared im getting an early labor. I just want to talk and share it to someone same as me pls enlighten me. Thank you 🙏🏻