PTU (propylthiouracil) is controlling your
thyroid in pregnancy, so missing doses regularly isn't ideal. Whether this particular tablet can be safely split depends on its coating and release type, which isn't something you can judge just by looking at it.
Next Steps
Ask your pharmacist or treating doctor whether this specific tablet is scored for splitting. Meanwhile, try swallowing it with a sip of water first, then more water or yogurt, tilting your chin slightly down, which often makes tablets go down easier.
Health Tips
Don't crush or split it on your own without checking first, since some tablets lose effectiveness when broken. Tell your obstetrician if the swallowing trouble continues.