Open Question: give me ALL ur opinions could i be pregnant or not?!?

ok so i have sex 3 1/2 weeks ago (unprotected) since it was my first time i was to tight and he couldnt fit it in but he kept trying for awhile i always look that up about chances of getting pregnant and they said as long as the penis comes in contact of even is touchin the vag pre-cumm n jst one lil sperm can go in (a very likely chance of getting prego) after i bled for 3 1/2 days so rough. well i have been ALWAYS TIRED no energy i hav dark rings around my nipples and bumps my lower back hurts minor head aches and dizziness and some pain sometimes in my lower stomach but i know its not my period bc it this never happend to me b4!
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