Pregnant or is my body playing tricks on me?

Ok, so I had unprotected sex 20 days after my last period in October and I always have about a 35 day cycle so I wasn’t expecting my period until next Saturday, the 29th November. I know my boyfriend and I should have used contraception, but the fact is we didn’t and I thought I would get pregnant. Then on friday (21st) I had some light spotting which almost went away that evening and I thought it was possibly implantation bleeding? Then it got heavy and pretty much like a normal period yesterday. So I thought oh ok it’s my period, and I expected it to get reaaally heavy because my periods usually are, with bad cramps. Only it hasn’t been that heavy (heavier than how implantation bleeding is described but not as heavy as my usual periods!) and I haven’t really had any cramps.

Today I’ve felt so sick and dizzy and the bloods almost stopped and it’s only been 48 hours as opposed to like 6 days… could I be pregnant? I’m so confused also because my periods have NEVER been this early before.. it came after 27 days and I haven’t had one that early since I was like 10 lol! Maybe I’m just obsessing over it too much but I just have this “feeling” that this isn’t period related blood.. Is it possible for implantation bleeding to be anything more than just spotting? And anyone expierenced a “period” the week after they conceived and thought it was a normal period ??? I don’t want to waste a test yet because I know it won’t be accurate. :-(