Is this normal?

So I'm 100% sure I'm not pregnant. Last cycle I was late and I took a first response day of my missed period then again two days latter and both were neg (-). I bleed 4-3 days latter for 5-6 days with med/heavy/light bright red flow. Two days before this cycle's fertile window was suppose to start (so 7 days before ovulation day is shown) I did a bj. No penis, fingers, cum/precum got in my vagina or around my vuvla area. it was strictly hj and bj to him. so yesterday i started my fertile period and i noticed yesterday and today i feel nasues after eatting and sleepy and ovulation is 5 days away... could this feeling nauses nd sleepy be due to my fertile window since it started day fertile window started? or a bug?