My wife is 5 weeks pregnant yesterday night she...

Treatmen of severe abdominal pain during conception:

It depends on the cause, but as there is severe abdominal pain, you have to visit your doctor or emergncy department immediatley to rule out abortion.

Causes of severe abdominal pain during conception:

It may be due to:

• Abortion which associated with pain, blood discharge
• UTI or Stones associated with burning sensation, change in urine colour and amount
• Gastroenteritis associated with diarrhea, vomitting...etc

Diagnosis of the cause of severe abdominal pain during conception:

It depens on the clinical examination of a gynacologist and investigations as:

• Abdomen and pelvis US
• Bhcg hormone test
• urine analysis...etc

What i advise you?

You have to visit ER or your doctor immediately for the right diagnosis.