Pregnant 4 weeks post d&c ?

I recently had a mmc on the 14/11. I was supposed to be 12 weeks but lost the baby at 9 weeks. I had the D&C; procedure 15/11. I bled for about 2 days which then stopped and started bleeding again heavier about 2 days after that for around 3 days.

I haven’t bled since but on the 30/11 I had some painful cramps and spotting for an hour which then completely cleared up. 2 days after I had unprotected sex with partner but got the MAP because we didn’t considered ourselves ready to go through the heart ache again.

But I’ve recently been feeling all my pregnancy symptoms again such as nausea, tiredness, runny nose, diarrhoea etc. So I did a first response test that came back positive straight away but I also bought another pharmacy brand which showed negative.

Does anyone think it could just be the left over HCG levels in my body or if I should wait a week and do another test. I would like to be pregnant again I’m just a bit worried.