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When a woman is pregnant, she might experience missed periods, nausea, and being constantly tired. However, stress can also bring these signs. Sometimes getting tested one week after intercourse may not give accurate results. If you want to be more certain, wait longer and do another test. 

As per the symptoms listed, an individual is likely to be having irregular periods. This can be attributed to hormonal imbalances, stress, or even weight changes. It is important to consult a gynecologist to establish the cause and then get the right treatment.
 

Changes in menstrual blood flow can be influenced by various factors, including hormonal imbalances, medications, stress, changes in weight, or underlying health conditions. Since you mentioned using medications for skin allergy,

Plan B is most effective when used as soon as possible after unprotected sex — preferably within 72 hours. It prevents pregnancy by postponing ovulation. However, it is essential to remember that it is not 100% effective. If you miss your period or notice any unusual symptoms, make sure to take a pregnancy test. 

Yes, methotrexate abortion can have side effects such as nausea, vomiting, and abdominal pain.

It is normal for girls to not have­ their period some time­s. The big reason is often change­s in hormones. Stress, losing or gaining weight fast, and too much e­xercise can all cause misse­d periods. Living a healthy life and not be­ing stressed can help. If you are­ worried, it is good to talk to someone you trust, like­ a parent or the nurse at school.

Many men with cystic fibrosis have fertility issues due to blocked or absent vas deferens. However, with assisted reproductive technologies like IVF, it's possible for couples to conceive. Discuss options with a fertility specialist.

Taking the i-pill twice in a short span can lead to hormonal imbalances and side effects, and your symptoms may require medical evaluation. Please contact a healthcare professional as soon as possible to discuss your symptoms and concerns.