Why does your heartbeat vary so much around 12 weeks because the was 130 and now at 15 it is 158 bpm should you worry that high now?

It is important to note that the fetal heart rate (FHR) can vary throughout pregnancy and there is a range of normal values. Factors that can affect FHR include the gestational age of the pregnancy, the mother's activity level, and the baby's sleep-wake cycles.

At 12 weeks of gestation, the FHR typically ranges between 120 and 160 beats per minute (bpm). However, at 15 weeks, the normal FHR range is between 150 and 175 bpm. Therefore, a heart rate of 158 bpm at 15 weeks falls within the normal range for this gestational age.

It is important to keep in mind that every pregnancy is unique and the FHR can vary from woman to woman and pregnancy to pregnancy. If you are concerned about the FHR or have any other questions or concerns, it is best to consult with your healthcare provider for guidance and reassurance. They will be able to assess your individual situation and provide you with personalized advice and support.