Pregnancy is not something which can happen definitely with treatment. Infertility is NOT a disease unless some abnormality is detected on investigations. It may happen that everything is normal but still the pregnancy is evasive
Next Steps
You are 33 and so it would be better to conceive at the earliest. For this I hope you have got adequate treatment of 6 months, done at a stretch. If your treatment is with gaps between them, it may not help. So you can go for continuous treatment for 6 months and if you are advcsed IUI it can be done for 4 times. If one doesnt conceive by these methods, test tube baby is usually recommended.