Both an elevated
prolactin and a raised
TSH can independently delay your periods, and having both together makes hormonal disruption, rather than pregnancy, the more likely explanation here given two negative tests already.
Next Steps
Starting
thyroid treatment is the right first move, and your
prolactin often improves once thyroid levels normalise, though it should be rechecked after a few weeks.
Health Tips
Please stay under a gynaecologist or endocrinologist's care through this rather than only monitoring blood values at home.