The data you provided (last period was 1st of October, had unprotected sex 11th 14th 15th October and next due on 25th, feeling very sick last few days, white thick discharge, belly cramps) might indicate that you are pregnant.
Conception occurs on the ovulation day which is exactly fourteen days before the start of the next expected menstrual period. If your menstrual cycles are pretty regular, than your ovulation day was at the 11th of October when you reported you had intercourse.
However, pregnancy cannot be confirmed solely on the symptoms you reported (feeling very sick last few days, belly cramps) and a visit to a gynecologist is recommended to either confirm or ruleout pregnancy. A physical examination, hormonal laboratory tests and/or ultrasound scan would be performed to check for pregnancy.
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