First time on birth control pill?

this is my first time on the pill (yasmin) and i started taking it for the first time at the wrong time of the month. not the 1st day of my period nor the sunday after. as a matter of fact i was supppose to get my period 2 weeks from then. well i stopped taking them after 4 pills and waited for my period to come. it actually came earlier and i took my first pill from a new pack that same day.my period came light and today is my third day and it looks like if it was my 7th cuz its so light. should i worry that i might be pregnant(spotting) or thats normal ? when don't i have to use protestion anymore? and is it normal that i get dizzy and nauseous ? ..... help plz..... i always use protection..... trust me im very paranoid bout pregnancy.....