Period and weight gain

Lena • Dump your boyfriend 💅🏽 live your best life 💅🏽 Australia 💅🏽 pro choice

I’m a week late for my period, I’ve gained 2kg in the past two weeks, even tho I eat healthy and work out almost every day. I took plan B about 3 weeks ago, I’ve done 4 negative pregnancy tests. My belly has been gassy and bloated. Is this real weight gain or is it more than likely just pre-period weight gain? Please answer 😭😭