Has this happened to anyone before? What are you’re thoughts about this?

I had my period the 8 and it went off the 14th

I spotted a week later on the 21st

Me and hubby just had sex about an hour ago and I went to the bathroom about 10-15 mins after and when I wiped it was very very light pink blood? My maternal aunt was pregnant with twins and had her period the whole 9 months my cousin didn’t know she was pregnant because the doctors kept telling her she wasn’t and she was pregnant with twins and got her period the whole time. My husband is an identical twin! Why are y’all thoughts on this??? Please help. Sorry ladies TMI