Had my period but pregnant?

If anyone can share a similar experience or some insight it would be greatly appreciated 🥺

So last month I had my period Aug 13-16. I used LH test strips after AF and had a peak reading on Aug 28. So I ovulated Aug 29 or 30. Thinking Aug 29 because I had ovulation pains that day. My temp stayed low after ovulation which I thought was weird. I took an hcg test on Sep 10 as I had cramping that whole week. While I waited for it to develop I started spotting pink/clear discharge. The test was negative so I figured that was AF. It turned to bleeding Sep 11-12 then tapered off to brown and stopped Sep 13. That’s normal for me

Fast forward to last night, Sep 17. I took a test because I’ve been severely moody. Like angry and irritated at everything and crying over stupid things. I knew I had just had my period so thought it was impossible but I saw a vvvvfl (Walmart cheapie). Retested this morning (blue dye) and the line came up immediately. My husband got so excited. How could I be pregnant if I just had my period? If that wasn’t my period, shouldn’t my line be WAY darker by now if I O’d Aug 28? Preparing myself to either find out those tests were faulty or it’s not a viable pregnancy 😔