I’ve always believed if you take a test & it’s negative, you’re not pregnant. However now I’m not so sure.

I was pregnant last August & had a miscarriage. Got pregnant again in December & lost it on Christmas. Each time insomnia was my first clue I was pregnant. Not sure why but I always get insomnia. Well we’d decided to put off actively trying for a while, but I wasn’t paying attention and we had sex during my fertile window a few times right up to my ovulation day. (I felt like I was ovulating & took a test. I was) so we stopped. Well during my 2 week wait the insomnia started. Like before. My period was due 3/17 but came 3 days early. It was light, and then the next day was period like flow & by day 3 trickled back to almost nothing. I’m currently not bleeding, but still have insomnia & my lower back has not stopped hurting for days. My husband still thinks I’m pregnant. I took a test this morning & it read negative but I FEEL pregnant. Tender breasts, lower back pain, insomnia/fatigue. Is it possible?