Confused ttc/ am I pregnant???

I'm 21yrs old I'm very confused an frustrated also I'm fertile right now an the past 2-3more days we have had sex an every morning I'm dizzy an feel sick 2 my stomach also the last time I got pregnant which was when I was 18 I didn't know til I almost 5months pregnant an when I took a pregnancy test back then it came back - even at 2 months so now I'm nervous an frustrated because idk when 2 test because of wat happened last time, plus my periods are really light an only last 2-3days tops now + My Obgyn said I wasn't high risk pregnancy when I was so I don't trust him. My man an I would rlly like a child.