Is period weight gain a thing?

I have a hard time deciding if I need to lose weight or if it’s from my period cycle. I haven’t done much research on premenstrual syndrome so I was unsure and figured I’d ask. Occasionally I’ll go up around 6 pounds at most, and it always scares me. Most of the time once my period ends it’ll go away, but I wasn’t sure. For reference I’m F 19 and am about 132 on the regular, but during these times spike to around 135-138. I get concerned and want to lose more weight, so seeing any increase really scares me.