Hi Can You Please Assist Me With Something....I Had My

hi can you please assist Me with something....I had my periods this month and the second periods lasted 3days and normally It takes up to 5/6 days, another thing is I'm constantly sleeping, naturally I love sleeping but nowadays I feel like I sleep too much because I can sleep until 12 in the afternoon then around 3 O'clock sleep again considering all those hours I slept throughout the night till 12am, then my other concern is I had sex today and right after sex I became dizzy and I couldn't see properly and this has never happened before so is it possible that I might he pregnant? last time I was and the pregnancy test showed me a negative sign so I don't want to get false results again *NB: I always use a condom so I don't know why I'm experiencing these things + I just get nauseous but I never vomit