If you're sent a wedding invitation with no +1 option but you are seriously dating someone is it ok to ask if +1 is an option?

I'm just curious. I've been invited to 3 weddings coming up in the next 6 months and my rsvp always just says party of one yes are you coming or no are you not coming. I've been dating my SO for 8 months and it's very serious. I can understand the stress and expense of a wedding but I was wondering if it would be considered rude to ask if I'm allowed to bring my SO

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