Miscarriage two months ago…

Sarah

Hey guys so I had a miscarriage two months ago in July. My hcg has been back down to zero since I believe two weeks after. I just got my first period since at the end of august and it just finished up last week. I haven’t been feeling good and super exhausted so I figured I’d take a test just to see and both clearblue and first response have faint positives that showed up before the 3 min mark. I don’t see how I can be pregnant if I just had my period but has something similar ever happened to anyone else? Thank you in advance!