Should I buy a test?!

So I’m supposed to start my period today and I haven’t but my belly has been cramping for about a week. Anyways, while I’m laying down tonight I keep getting like sharp (not very painful) pains on my left side and kind of like into my vag. Any ideas?

Also when I was pregnant with my daughter I had been cramping like I was gonna start my period. Hoping this is the same thing!!!😊🤞🏻

And I have a fertility appointment on Wednesday!!