UNWANTED PREGNANCY - I'm afraid i will lose my job

Im 31 yrs old from philippines, worried if i am pregnant or not. im always tired, my back is aching much. i have the feeling of nausea, my breasts are tender, sensitive and enlarged and im gaining weight but i never have a test for pregnancy for i am afraid to know that i am pregnant. i am afraid because i will be losing my job if i am and im the breadwinner in our family.my cycle always run on a 28 to 30 day period and never missed any menstration.all my menses are regular and will lasts for only 3 days.but with so much stress at work now since i am always on field always riding a motorcycle on a rough road, i had my abnormal menstration as i say it on august. i say its abnormal because i have menstration on august 18, a tiny spot. then on the 19, no spot at all. on the 20 and 21, tiny spots again . on the 22 and 23, many blood came out. on the 24, small blod came out as the usual blood on my last day of regular normal menstration. however im having spotting even on the 28th day, im stil having a spotting. since the last day a blood came out of me was on the 28th, im confident to have sex on the 1st day of september just this year without using contraceptives thinking that i will never get pregnant since its only 4 days after my last menstration .meaning to say, im still safe. did i count it wrong? 

i never had menstration on the month of september and october will soon end and still i never have a menstration. am i possibly pregnant? i am worried because on the night of september 29 up to october 2, i drink 3 glasses a day of a very bitter liquid .it came from a bark of a camia tree which i boiled then drink... i aslo took a chinese tablet last week of september hoping that i will bleed. but i didnt. this tablet is the one i used before when my stomach is aching and tiny blood came out. when i take it before, many blood comes out and it eases the pain on my stomach. since i never had menstration on september, i searched the net and tried to read about ascorbic acid. i then take 2 tablets of 500mg every after 2 hours for 5 days. i then had dark brown discharges and theres presence of somewhat granules in dark brown color too and i felt so much pain on my back and i felt so tired and nauseted and feel that my stomach is in hyper acidity and felt bloated. on the 4th night of taking, a fresh tiny blood came out when i urinate. but only that time, nothing follows. i planned to take it ascrobic acid up to 10 days but i can no longer take it because of the taste,the smell i hate it anymore and the hyperacidity im feeling to my stomach. so i stopped it on the 5th day for if i will forced myself, i will just vomit it for sure. but until now, im still taking that chinese tablet named BUTIAO. and until now, i am having dark brown discharges. i also let my body becomes so tired by exercising. the more i exhaust my self, the more tired i become and dark brown discharge are present. what is this all about? is this miscarriage? will this lead to miscarriage? am i risky on this kind of situation? pls help me. i am really not feeling well all the time and just yesterday, i never eat the usual thing because even water can make me vomit and i vomit all i ate yesterday. i have no breakfast, but i vomit all saliva.i forced to eat lunch yet i vomit in the evening and nver eat at night and slept lately coz im not at ease. then today, i never eat breakfast lunch and diner.  i felt that my whole body is having an earthquake.all is shaking. i am having flu, cough, colds.im confused bothered worried.

i talked to no one. i never told my sex partner because we dont have relationship at all. we just do it as frends with benefits no strings attached for i am afraid of commitment. does all the activities i have done (im refering here to the medicines i took) readily affects the baby if i am really pregnant? if i am pregnant, i dont want to born this child because im afraid to loss my job and i am not ready to accept the consequences of my actions regarding baby defects. what will i do to get rid of this ? pls help me, i am in indire need your advice the soonest possible time. im hoping for your response. thank you.