Hair dye when ttc

So I normally dye my hair bleached blonde. It is naturally dark blonde... Before we started TTC, I got lowlights in my hair to try to match my roots so that I could grow my hair out and not have to dye it when trying to conceive or when pregnant. The problem is my natural color is darker than I thought and my roots are still very obvious. Is it safe to go have another set of the lowlights done so that I can grow my natural hair out?