Jeans feeling snug?!

So I’ve been watching what I eat for the last month. We’ve been trying to get pregnant for almost 2 years (20 months). In the last month I’ve lost almost 10 lbs and was feeling and looking thin. I even went down a size in jeans...but suddenly 5 days before my period is due I’m noticing my pants aren’t fitting the same but it’s too early to test. Anyone else notice this right before a bfp? I don’t generally get super bloated and just wondered. Ya know nothing like symptom spotting in the TWW! ;)