Shi ni Modori no Houseki Hime wa Nidome no Jinsei wo Ouka suru.

The manga centers on Lucia Stearon, a princess who possesses a special physical characteristic that transforms her bodily fluids into "jewels." Lucia has dedicated her sweat, tears, and even blood to her country since she was a child. But on the night of her wedding, she is poisoned by none other than the prince she married. Lucia miraculously wakes up, but finds herself back in time six months before her wedding.

(Source: Anime News Network)