I think I'm bloated after beginning a new exercise routine?

I had been doing the same routine- cardio with (what I would say was) not enough strength training, for a long while. I've added more strength-building exercises in and I'm pleasantly sore- but it's only been a couple of days and this morning I weighed 105.7, which is I guess 1.5 or 2 lbs more than my regular weight (I'm 5 ft 5 or 5 ft 6-ish), and I wouldn't usually be so worried because I know that people often gain weight when they change their exercise routines, but I'm also really bloated! Or I think so, at least. I look in the mirror and my stomach looks more distended than usual and I honestly can't tell if it's fat or if I'm just bloated. (I should add that I usually poop a lot right before I weigh myself in the morning, but that simply hasn't been happening lately for one reason or another, though I wouldn't say I'm completely constipated per se)

I'm also on birth control for a hormonal imbalance which has thrown my menstrual cycle off, and when I'm on my period I often get bloated and constipated and gain some weight. But I wouldn't usually be having my period around this time.

This is all just awfully frustrating. I'm not eating any more than I usually would and the fact that I can't tell whether or not it's a natural body cycle or weight gain makes me feel like I have no control over what's happening to me.