confused

taylor

so i started spotting saturday , by sunday it was a regular period, not heavy but not light. i took a pregnancy test and it came back positive on sunday took another one this morning (monday) and it was negative but now my period has gotten lighter and now just brown and red blood mixed. i’m confused ?? was i pregnant and miscarried ? or was it a chemical ? i don’t understand why i’d get a positive and then a negative a day later