I need advice!!!!

I had a mc in Jan and i would’ve been due next month🥺. Now the mc has affected me so much more than i thought it would! I have been invited to 3 baby showers and only attended to 1 because she is an actual friend of mine. Either way i only went for a couple of hours since we were only 1 month apart it was hurting me being there. Now my sister in law is pregnant and my other sister in law(her sister) just txt me if WE want go start planning her baby shower🥺🥺🥺 First of all, anything that has to do with gender reveals and baby showers are super emotional to me.. dont get me wrong i can buy a beautiful gift but i CANT plan someone’s baby shower knowing im going to be hurting! And another thing she knows im starting school next month and my husband and i are paying for it! I dont have no grants, fafsa, scholarships and she is well aware we will be in a tight budget till im done. How can i tell her i cant!? I dont want to sound mean or rude?