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Chances are low that you are pregnant (with the pill and the negative test and the timing of sex). Yes, the symptoms could be caused by hormonal changes. I'm a little confused at the dates you provided. When did your most recent cycle start?

My menstruation started on the 13th of January which is last Saturday. I bled for roughly 5 days as usual, until the 17th, which was the Wednesday past. Right now I'm on day 9 of my cycle. Therefore I had sex on day 4 and 5 of my cycle.
I had those tingling sensations before but at different points of my cycle. I also did a healthy run on Saturday morning for the first time, could that have something to do with it?

You don't ovulate until roughly 14 days before the end of your cycle (so 14 days before your next period). So you likely would not have ovulated yet. You need to have sex in the few days before ovulation to get pregnant. A pregnancy test won't be accurate until about the expected day of your next period. You're very likely not pregnant.

Here is a link to the information on the site about the cycle, ovulation, fertilization etc.
https://www.countdowntopregnancy.com/getting-pregnant/

These should help you understand what I'm trying to describe :)

Could I still ovulate on the pill?

Also thank you very much for all the advice. I will update you once I'll take another pregnancy test before my next period. :)

You shouldn't ovulate while on the pill (if it's taken correctly).