Why am I bleeding? please URGENT

I went to the bathroom to poop, and I got up and noticed the whole toilet was filled with blood. The blood was very watery. I'm on birth control the pill. And the latest I've been was 10 min and that was last year. I didn't feel any pain when using the restroom. But I've been a little constipated. With a little bit of lower stomach pain. Also, I've been taking a lot of ibuprofen and the last time I have unprotected sex was February 14th. I went to the restroom to pee a little bit ago and when I wiped, there was blood as well. But there's no staining in my panties. Will someone please help me? I'm freaking out and idk what to do.