Could I be pregnant?

I have PCOS so my periods are never regular. So it’s hard for me to really know when I should be expecting them which is why I started using this app to keep track of when I start so I can see if I find any sort of pattern. So I’m always taking tests when my body starts to feel weird just because of my job I need to be able to take extra precautions. I had started spotting thinking I was going to start my period but it was super light brown/pink and only lasted 3 days. After doing some research I started to think it was implantation bleeding bc my periods are at least 7-10 days long. So i decided to take a test about 4-5 days after the bleeding stopped and I had posted this picture in another forum to see if anyone else saw a vertical line or if my eyes were just playing tricks on me. I took this test on 6/28 first thing in the morning. Then I used another Clearblue test on 6/29 first thing in the morning and it had a slightly more prominent vertical line (sorry I don’t have a picture of that test). I have been feeling nauseous, my back hurts, my boobs feel heavy, I’ve been peeing a lot more than usual and I am always tried and ready for a nap more than I usually am. I had taken another test (First Response) on 6/29 in the evening, about 12 hours after I took the Clearblue test that morning, and I didn’t see a very prominent line on that test (I think my eyes were playing tricks on me with that test). My fiancé n I had sex the night of 6/29 and this afternoon, 6/30, I started spotting like its the beginning of my period. Could I be pregnant or do you think they were just false positives?