Weird symptoms, no period, negative test..?

So I know there can be so many reasons as to why you can’t have your period whether it is stress or eating habits etc. BUT I’m very familiar with pregnancy symptoms... Over the past 2 weeks I’ve experienced some unusual things like example: 3 days before I was supposed to have my period I was bleeding but it was bright red and very light. The blood was for like 2 days long and had no odor. I have always had a heavy flow menstrual cycle and I mean HEAVY HHAHA. Also my period is 13 days late... my nipples are very sore and I took a at home test and it was negative. My mom said she was negative when she was pregnant with me and then later found out she was pregnant. So is there a possibility I might be pregnant???

Thanks