My period started just now, how do I tell my new boyfriend I’m on my period without making things awkward?

Anonymous
I know this is a tmi kind of question so I apologize. I’m 20 and my boyfriend is 22. We’ve been together for almost a month now. 2 days ago I agreed to go to the gym with him tomorrow, but my period just started now and I don’t really like doing workouts during the start and middle of my period cause that’s when my flow gets heavy and I’ve worked out before at home while I’m on my period and I always end up bleeding through my pants because of putting my body in a different position in which my flow goes in a different angle than my pad (sit ups, squats, whenever I’m on my stomach), so I really prefer not to bleed through my pants at the gym tomorrow and embarrass myself in front of my boyfriend. I’d wear a tampon, but tampons are too big for me to wear, so I’ve always worn pads. But how do I tell my boyfriend without feeling embarrassed or awkward that I’m on my period. I know he won’t take it too immaturely (I think) cause he’s mostly around his older and younger sisters sometimes and he’s a shy/quiet type of guy, so I just don’t want to make thinks awkward if I tell him. I’m not sure how to tell him that I can’t go to the gym with him tomorrow. I do want to tell him that I’m on my period and not say something like, “I’m sick” (cause then I wouldn’t be in classes) or “I don’t feel like going to the gym” (cause then it just sounds like I’m lazy) what do I tell him?
My period started just now, how do I tell my new boyfriend I’m on my period without making things awkward?
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