I ended my menstrual cycle on Sept.9 & me & my partner had sex on Sept 12, he did not pull out , he is positive he fined inside of me , i gnored it untill Sept.20 i had very light pink transparent spotting only when i wiped it ended on saurday. & on Sept 19 my lower back has been aching on & off for the past 6 days straight. & on Sept 20 i fell asleep very early at 8 pm, slept a goof 16 hours straight. since Sept 22, ive been feeling very bloated & gassy, could i be pregnant? I apologize for the quite long explaination of the situation , i just really need answers please.