Cramping and back pains few days after period?

Cheryl • 👼💙👼💙👼 👼💙

So my period finished on Saturday last week so I’m on day 7 of my current cycle. This is cycle 3 of trying to conceive and I’m 40. I’ve today been experiencing the worse lower back pain and cramping on my ovaries? Does anyone know what this may be? My cervical mucus is really wet today. I tested for ovulation on the sticks and it’s negative? So confused any advice would be welcomed x