I was masterbating and have a low placenta i felt my cervix with my finger will i be ok im 17 weeks pregnant ?

Low lying placenta: If you are not bleeding, you are fine.

Yes: Yes, you should be fine. Just because your placenta is low and just because you felt your cervix, don't worry unless you induced bleeding & contractions. Placenta will migrate away from cervix as pregnancy progresses. Just continue eating right, taking prenatal vitamins, exercise as appropriate & get plenty of sleep (you're going to need it!). And do what you want w/o worries in privacy of ur home