What could it be

My boyfriend and I fooled around at september 21. We dindnt have sex but i saw his precum near my vagina, I didnt see it ON my vagina but near it around my inner thighs.

My ovulation was on the 30th based on my app and tracking my basal body temp and cervical mucus. I took a pregnancy test on the October 10th 4 days before my period is due and 10days DPO, it was a clear negative.

Eversince october 4th and the week that i have been studying for our finals i have been feeling woozy, like i want to sleep all the time and a feeling of strain in my eyes and lightheadedness, until now i still feel that way.

I am worried it might be a symptom of pregnancy even though my test was negative and i didnt have sex. Thoughts please? I hope im not pregnant im not ready yet i hope its really negative. Thoughts based on the timeline?