Spotted after sex

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I am 4w6d. I had a BFP at 3w3d. Confirmed at 4w at my local health department.

I've had slight cramping on and off pretty regularly.

Today my hubby and I had sex and afterwards I had some blood (not a whole lot) and a bit of cramping. Its been 4 hrs and I still have some cramps but no bleeding.

I'm nervous. My first dr apt is the 19th. Now what.