When Did I Conceive?
Wondering When You Conceived? If you’re pregnant and trying to understand when conception may have happened, you're not alone. While pinpointing the exact moment of conception isn’t possible, there are ways to estimate it based on your body’s natural cycle. Need help now? Text 843-536-0002 to connect anonymously with a nurse at no cost.
What Date Did I Conceive?
Even if you're unsure of the exact day, a good starting point is understanding your menstrual cycle. Ovulation—the time when you can become pregnant—typically happens about two weeks after the first day of your last period. This fertile window usually lasts two to three days each cycle.
By counting back from your current stage of pregnancy or using the date your last period began, you can estimate when ovulation (and possibly conception) occurred.
Conception Date Calculator
By calculating the time since your last period, you can get a rough idea of your ovulation window and, hence, when you conceived.
If that math is a little tricky to do in your head, there are free online calculators to help like the one below, or you can text us at 843-536-0002.
Again, this is just a rough approximation. It’s important to remember that each woman’s menstrual cycle and ovulation window are different. Some ovulate for longer periods of time than others, and some have theirs earlier or later during their menstrual cycle.
Also worth noting—sperm can live inside the female reproductive tract for up to five days. That means sex that happened several days before ovulation can still lead to pregnancy.1, 2
Conception Calculator
Conception Date from Ultrasound
Ultrasound is one of the most accurate ways to estimate when conception occurred. Since fetal development follows a predictable timeline, an ultrasound can help determine gestational age, giving a more precise estimate of the conception window.
In addition to helping you understand your pregnancy timeline, an ultrasound can confirm that the pregnancy is progressing normally and rule out potential complications, such as miscarriage or ectopic pregnancy.³
Ultrasounds can be done at an OB/GYN office, though there may be costs or insurance paperwork involved. Many local pregnancy centers also offer free ultrasounds, without needing to go through a hospital or insurance provider.
Get Help Determining Your Conception Date
Trying to calculate when you conceived can bring up a lot of questions. If you’re feeling uncertain, we’re here to help.
Text 843-536-0002 to speak with a licensed nurse, ask questions about pregnancy, or where to schedule a free ultrasound. Every message is confidential, and support is always free.
Sources:
2. https://my.clevelandclinic.org/health/articles/23439-ovulation
3. https://my.clevelandclinic.org/health/diagnostics/9704-ultrasound-in-pregnancy