it sounds like you may be having an early miscarriage, I would go visit your doctor and have a couple of blood tests done to measure the amount of hcg in your blood, heavy bleeding in eraly pregnancy usually isnt a good sign, but pregnancies have been known to remain viable after such a bleed but the only way to know for sure is to have your hcg levels checked
True false positives are extremely rare. You got three in a row, so not likely. When was your period due?
Sadly, it's quite possible that you're experiencing a chemical pregnancy. This is when a fertilized embryo fails to implant and is ejected from your body a few days later. It's a very early form of miscarriage. Most women won't even notice; they'll just get what looks like a slightly late or heavy period. This is usually confirmed by a negative pregnancy test within a few days.
About half of all pregnancies with bleeding in the first trimester do go on to be successful. Heavy bleeding should be reported to your doctor in any case.
I would contact your doctor about the bleeding and see if they want you to come in yet. You might be asked to wait it out for a week or two and take a followup pregnancy test, or they may want to check your blood hormone levels over time to see if they are rising or falling.
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