Anyone else?

Ok so I’m just curious about something. Me and my boyfriend had sex a week before my period and according to the period tracker I use I was ovulating that day. Well I got my period exactly in schedule and then the day after it ended we had sex. About 5 days after this I was extremely moody, nauseous, and my breasts were extremely sore. I knew there was no way I could be pregnant but I took a pregnancy test I had laying around for shits and giggles and there was a very faint line. The next day I bought 2 digital tests and boom, pregnant. I took another test today to see if the lines would get darker (to see if my HCG is increasing) and the line is still faint but slightly darker than when I originally tested 5 days ago. Has something like this or similar ever happened to anyone else and what was the outcome? I think I’m either verrryyyyyy early or this is just a chemical pregnancy.

Side note: I had a miscarriage at 8 weeks last November