Help! Ongoing miscarriage or weird next period?

[JaneEyreFunfair]

I'm now nearly six weeks on from a natural miscarriage. I bled for about three and a half weeks and was still getting a positive test four weeks after, so I went to try and get a follow up scan. However, they did a urine test and it was negative (only two days after I had last done a positive test) so I went away relieved that it was all over.

That was only a week and a half ago, so it seems very soon to get my period, but since Thursday, I've been having light spotting on and off and also some largish clots - ie, stringy, stretchy bits of brown blood. Hardly any liquid blood. I am a bit baffled and can think of three options :

A: It's my period. I know the first one can be a bit odd after a miscarriage, but I didn't think it was possible so soon after the pregnancy hormones disappeared.

B: The last bit of pregnancy material detached itself last week, hence the negative test, but is only just working its way out.

C: The hospital somehow got a false negative (it wasn't first morning urine) and this whole sorry miscarriage saga is still ongoing.

I had a bit of a meltdown yesterday, thinking it was option C. I'm about to go on holiday for a week so there's not much chance of getting any medical input until after Easter. I could do another test with first morning urine, but if it was still positive, I would have it hanging over me all holiday without being able to do anything about it.

Does anyone have any knowledge or experience they can share?