Spotting/Cramping

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I’m 12w+3d. I have been spotting for three days and it’s gotten darker every day. I had an ultrasound and they said everything looks fine, that they can’t find a reason for the bleed. There were two small dark clots earlier today. I’m starting to feel a lot of pressure in my low abdomen (like someone’s pressing on it) and cramping that’s sharp...I’ve been told it’s RLP and not to worry unless I bleed enough to fill a pad. BUT I STILL WORRY. Anyone else going through this??