Could I Be Pregnant Despite Having My Tubes Tied, Given The Missed Period And Light Spotting?

I’ve had my tubes tied for 11+ years but I was 7 days late for my period that was supposed to start March 23. On the 7th missed day I started spotting very very light for 3 days. That’s not normal for me so I took a test and it was a almost invisible faint positive. A week later I started feeling bloated, gassy, emotional, crampy, pulling sensation, headaches off and on and then vomited at 3:00 in the morning so I took another one this morning since it’s been 2 weeks since I took the last test and it has a very faint but noticeable positive line. What could be going on?