Hello I share your concern Chances of pregnancy or ectopic pregnancy is there if you had unprotected sex near ovulation. Brownish discharge with pain in abdomen might be related to infection of the urogenital tract or PID In my opinion you should consult a gynaecologist for transvaginal ultrasound to rule out possibility of pregnancy and confirmation of diagnosis after physical examination and battery of tests Meanwhile you should take plenty of fluids to maintain good hydration and this will also help by flushing off the urogenital tract You should use condom during sex until you recover fully You should maintain good hygiene Hope this answers your question Please feel free to ask for follow up or further clarification I will be happy to help you Best wishes