Masturbation, is it okay?

As a young Christian woman I have made the decision not to have sexual relations with my fiance. We have both has sex b4 our relationship and we have had sexual relations b4 while dating. We are now in our mid 20s We have been abstaining all of 2019 so far. I don’t want to have sex with him until we are married and we just got engaged this summer. During the time that I ovulate I get urges. Usually i can distract myself from it but biology will be what it is. Is it wrong or sinful for me to take time for myself and touch myself? I feel dirty or shameful when I’m done but I still think of doing it and only when i’m ovulation gets when the urge is strong. Glow sisters, what do you think?

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