Confused & uncertain

Hi everyone!
I'm struggling with huge insecurity! I've actually been off the pill for 2 months now because we want to try for a baby. There's no pressure to hurry since we have a house and are still partly renovating. Now here's the thing; in my first month off the pill I had a 27-day cycle, so I'm basing myself on that.. In my second month off the pill I should have gotten my period on or around August 2nd. A week before that, on July 27th, I started getting light pink spotting and mild lower back pain, I thought my period was coming, but no.. I had this kind of spotting (a few drops per day with some mucus) until August 1st and then it stopped completely.. I'm also nauseous and throw up regularly, especially from after dinner until I crawl into bed, my breasts are fuller and I clearly see a whole network of veins (which I never have otherwise) sometimes I get a slight stab in my nipples and still have mild lower back pain.. I thought I might already be pregnant since I still haven't had my period, if I continue based on my previous 27-day cycle then I should be 4 days late so I did a home urine test but it was negative.. I'm worried because I have a throbbing pain in my left ovary.. Looking at all the symptoms I really feel like I might be pregnant but with the negative test I have huge fear of an ectopic pregnancy. Does anyone have advice for me or has experienced this themselves! Feel extremely insecure!

Greetings