So what are your actual chances to conceive, if your last intercourse was three or more days before ovulation? Choose the Right Birth Control. Here are 17 natural ways to boost fertility and get pregnant faster. If a man holds ejaculation for a long period of time, say a week or two, a large percentage of his sperm will be dead or decaying - and the decaying sperm may contaminate the fresh, new sperm. With this definition of a period, you cannot ovulate while on your period. We mostly did the doggy style and me on top, also side positions.