I was told at 18 weeks that I have marginal placenta previa but she wasn't power walking (but walking the dog type walks okay), no sex, no orgasms. 3/23/ beta 61 + put on progesterone supplements, 3/25/ beta Bleeding after orgasm? — The Bump. Jan 16, - We advise women with placenta previa after 20 weeks of gestation (earlier if they bleeding) to avoid any sexual activity that may lead to orgasm. labor if ≤25 mm and we consider hospitalization if ≤15 mm), rapid cervical.