Hello,
After going through your history, you did have unprotected sex and missed your period. In reproductive age of missed period, we have to rule out pregnancy first.
As your home pregnancy test is negative please consult a Gynecologist and get a
blood test of Beta HCG and
Ultrasonography including transvaginal to rule out pregnancy.
Once pregnancy is ruled out then other causes could be severe stress, hormonal imbalance, sudden
weight loss, some drugs if taken. Other causes can be treated by your doctor.
Please remember ejaculating outside is not safe way of
contraception please practice safe sex and use some regular
contraceptive there are many alternatives.
Hope I have answered your query. Let me know if I can assist you further.
Take care
Regards,
Dr Ivan R. Rommstein, General Surgeon