Could contraceptive pill delay my period by 1 day?

It is vital to ask for advice from a gynecologist or a specialist in menstrual illness if you have any issues pertaining to your menstrual cycle.

It's difficult to determine pregnancy solely based on the timing and characteristics of your period, as there can be variations in menstrual cycles and bleeding patterns. Also , symptoms like nausea can have various causes and may not necessarily indicate pregnancy.

A bad odor during periods can be a symptom of an infection. It could be bacterial vaginosis or an STI. Kindly go to a gynecologist for the right diagnosis and treatment.
 

Pregnancy symptoms normally do not appear until a few weeks after unprotected sex. Nevertheless, if you are experiencing some stress, you might want to take a pregnancy test around 3 weeks after the sex. 

You are likely experiencing the fluctuations of normal vaginal bleeding. Bleeding for 2 weeks, a break, and then a period again could be due to hormonal imbalances, thyroid issues, polyps, or fibroids in your uterus. The primary step here is to see your doctor who will examine you and order tests to find out the exact cause. Medication or minor procedures are the possible treatment options based on the diagnosis. 

Worrying about pregnancy is normal. Pre­-ejaculate can sometime­s lead to pregnancy, but chances are­ lower than regular ejaculation. Missing pe­riods, nausea, exhaustion, and sore bre­asts indicate early pregnancy symptoms. Taking a pre­gnancy test from drugstores or clinics provides clarity. It's wise­ to eliminate doubt. If not pregnant, using prote­ction during sex consistently preve­nts unintended pregnancie­s and sexually transmitted infections.

BASED on your hCG level, YOU could be pregnant... However, the scan DIDN'T show anything yet... Your last period was on 16th October, so it's possible you're just a little over 2 weeks pregnant... You should wait a few more days and take another test... If it's positive, schedule an appointment with your doctor.