Honestly, don't try to guess from the HCG numbers alone. If you suspect anything abnormal, go to your gynac and get a scan done. That is the only way to be 100% sure.
Yes, HCG does increase in an ectopic pregnancy, but it usually rises much slower than a normal pregnancy. My doctor told me that instead of doubling every 48 hours, it might increase sluggishly or fluctuate.
HCG levels do rise, but please don't rely on self-testing. If you have any sharp pain or bleeding, you must contact your gynac immediately as it's a serious medical issue.
Please check with your gynac immediately if you are worried about ectopic pregnancy. This is a very serious medical condition that needs urgent doctor attention, don't rely on online reports.
Paying for serial HCG blood tests can be stressful, but it's very important to check the trend. If there's any risk of ectopic, a proper ultrasound scan is the safest way to confirm.