implantation bleeding or period?

I had sex January 3rd and the 4th then I got my period on the 7th of January and it stop the 12 . then I had sex again the 13 started having alot of milky white discharge . and on the 18 I had sex again and on the 20th I started bleeding but no cramps but before the bleeding started I got back pains and I felt like bubbles in my stomach and dizziness . bleeding started the 20 and it stop the 22 . I had sex again the 24 and watery discharge came out after sex and spotting. I been having alot of fatigue headaches and been tired asf .

... what y'all think ? what can it be ?