There are no absolute signs that will indicate pregnancy with certainty or rule it out until you can reliably take a pregnancy test or until you get your period. All kinds of ovulation patterns can turn into pregnancy charts if there is well-timed intercourse. Your chart does not need to show any kind of ovulation pattern or post-ovulation pattern for you to be pregnant.
If you get to 18 days past ovulation with high temperatures and no sign of your period, you are most likely pregnant.
Some characteristics of pregnancy charts
- Your intercourse pattern shows you had intercourse within your fertile window (the two days prior to and on the day of ovulation).
- Your chart clearly shows ovulation occurred evidenced by a rise in basal body temperature and a biphasic pattern.
- Your temperatures stay elevated beyond the usual luteal phase length.
- Your chart may show a temperature dip around 7 to 10 days past ovulation.
- Your chart may have spotting recorded when implantation is expected to occur (which is about 7 to 10 days past ovulation).
- Temperatures may show a triphasic pattern. Your temperatures rise to a third higher level that is sustained around 7 to 10 days past ovulation.
- You get a positive pregnancy test.