Advice, conflicting tests

Hi. I’m going to try to keep this shortish but I can’t sleep and I figured I would reach out to a community that knows what I’m going through. So I had cancer when I was 18. I was told that having kids would be difficult. At 26 I got (unexpectedly) pregnant with twins but lost one at 8 weeks. I have a healthy 11 year old now with a man I’m no longer with. My husband and I tried for about 2 years (tracking and recording everything) to get pregnant. (He was told that he has a low sperm count and that it would be harder to conceive.) We have sense given up and decided it just must not be in the cards for us. I had a doctors appointment on the 26th, just a regular physical. Was told everything tested fine. My period was due on the 27th. Nothing. Last month my period was super early (like 12 days) and very long. I just took a test and it said I was pregnant. Took a second test and it said not pregnant. What!?!? Anyone have this happen? Thoughts? We are a mess.