A 5-month gap in your periods, together with light irregular bleeding and daily white discharge, usually points to a hormonal cause rather than a simple delay. The main possibilities at your age are PCOS, stress or weight-related hormone changes, or pregnancy if you've had any unprotected contact.
Next Steps
Start with a home urine
pregnancy test, since that rules out the most urgent possibility fast. If it's negative, a pelvic ultrasound and a hormone blood panel will usually show whether PCOS or another hormonal imbalance is behind this.
Health Tips
See a gynaecologist sooner if the discharge changes color or smells unusual. The same goes for pelvic pain or fever, since those need prompt in-person treatment.