Did I have a miscarriage?

I’ve had sex with my current bf twice. Once without a condom and once with. He said he pulled out. My mom won’t put my on birth control yet bc I’m only 15. I was experiencing really bad lower back pain which is very abnormal for me, even though I have scoliosis it’s usually in the upper back where I feel pain. I thought it was just my period (as I’m on mine rn). But I went to use the bathroom and a medium sized clump came out. It looked very strange and so I’m worried. If I was pregnant and miscarried this will be my second time. (Ik ik I need to get on the pill and be careful). I’m just not sure what happened exactly bc my period has been VERY abnormal so far.

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