Looking for advice, what is this I passed today? Uterine lining

So I'm due on my period but I'm a few days late. I'm on the pill (the one you take for 3 weeks then have a week break) been on this pill for 3 months

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I emptied my cup last night (day 1 of period) and this was in it …. Really freaky. It is gray fleshy and 1.5 inches. Last had inter course a month ago

Looking for advice, what is this I passed today? Uterine lining? ***WARNING GRAPHIC PHOTO**

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