Annoyed

So I started my period and I texted my mom that she needed to go get pads and she came home and was like this was the 3rd time I went to the store today and she was completely pissed at me. And I was like well if I could I would be like hey sorry can I take a rain check? It isn't a good time right now. Thanks!  But no I can't so stop being pissed at me for something I can control and she was like just shut up! It was like she never had this happen to her before