Is it possible to show signs of pregnancy 3 or 4 days after ovulation?

I pee constantly, I have stomach cramps, I get dizzy every time I get up, I loose equilibrium while walking, I get dizzy every now and then, my vision gets blurry sometimes, I have very strong nausea all the morning, I feel food aversion, I feel more exhausted than usually, also my body temperature raised a from 35.5 C° to 36.5 C°...

I must say I took levonorgestrel two days ago to avoid pregnancy, but it never ever before gave me side effects (and anyways they only last two days, today I should already be good), and it has a very high chance to fail if you had the risk practice during your ovulation day, so I'm starting to get paranoid over being pregnant....