Possible ectopic?

I was a day late for my period last week when I got a very obviously positive pregnancy test. It came as a shock because we were definitely not trying, as we have a very beautifully needy 16 month old 😊. I would have gotten pregnant 3 days after predicted ovulation day. I was surprised but .. crazier things have happened! The day after I tested positive I started lightly bleeding. I’ve had a miscarriage, a chemical pregnancy and a healthy pregnancy before WITH bleeding so it really didn’t come as a surprise and I had no idea which direction I was going on. Over the next few days tests got lighter so I assumed it was a loss. It’s been a full week now, as of 2 days ago test was just about negative. However, I feel like I have a few symptoms. How can that be? I have severe fatigue, like pregnancy fatigue, not just tired mom fatigue. I had a very bad headache Friday night, which was the day I started bleeding, chalked it up to the pregnancy hormones. Except I’ve had the same kind of headache just not as bad, the last 3 days as well. Have had on and off stabbing feeling in my left side too. Can you have pregnancy symptoms after testing negative? I’m assuming it was a chemical pregnancy because it was so early.

Is there a possibility of it being ectopic. Can you have an ectopic pregnancy with dropping HCG? Very positive test to completely negative test within 5 days? Hoping someone can give me some insight. Thinking of going to ER, doctors office was completely unhelpful