The success rate of IUI per cycle is only about maximum 18-20% ( presuming your tubes are fine). You may need upto 3-4 cycles to conceive. Since your age is 37yrs, it would be ideal for you to have
AMH levels done to check on your egg quantity and accordingly plan for next step of treatment.
Health Tips
The chance of pregnancy dips after the age of 35; kindly be proactive with your treatment plan. Considering your age,"TIME" is an important factor and should be given due consideration