What Causes Dizziness After An Intercourse While On Implanon?

hi my name is chantelle iv had the inplant for 6 months now but dint have sex for that peried of 6 months .but i had it 3 weeks ago now its th 4th week and at night i feel sick iv been sick to feeling tired moor. and dizzy i feel preg but am i please help as im worried chantelle garland