Hay, don't worry too much moms, constipation during pregnancy is super common at 17 weeks, and a bit of spotting after straining from hard stools happens to a lot of us din, lalo na kung nag-effort talaga. The good thing is wala na agad after and your discharge looks normal, which is reassuring, pero since you're not at peace talaga, definitely mention it to your OB on Saturday na lang para ma-check properly and you can relax na. In the meantime, keep up the prune juice and water, a few of us swear by adding fiber supplements din (check with your doctor first) and drinking pa-init na tubig to help soften things, kasi talaga, ang constipation plus straining is a combo na can cause that spotting. You're doing the right thing na healthy, at least!