It seems that you don't want pregnancy and to rule out that possibility the fastest way is to have a blood test
(hcg) for your wife as soon as possible.
If the pregnancy test is negative you should take a reliable method of contraception
such as the intrauterine device
or the three monthly injectable, or the sub dermal implant.
If the test is positive your wife should start Folic acid
supplementation and visit her doctor as soon as possible to have a pelvic ultrasound
to confirm a healthy intrauterine pregnancy and to rule out ectopic pregnancy.
I hope these words were useful to you and I wish you best luck.
Dr. Ahmed Bahaa.