Hi , I Normally Have Irregular Periods And I Just

Hi , I normally have irregular periods and I just finished my period last month around April 25-26 th I can't remember what day I ended exactly but it was around then... I had unprotected sex like the 1st of May and about two days ago I felt like my cravings for sweets like my period was coming but I'm thinking maybe I just have a sweet tooth right ? I had slight Back aches and a little sensitive to smells...

about 30 mins ago I went to the restroom and it looks like I may have started my period but my flow is normally really heavy.. it's like a pinkish color right now tho, and it's not much stained on my underwear. I use the restroom , wiped ..and it's still very light I didn't put a tampon in because it doesn't look that heavy to do so , I just put on a light pad . I googled some stuff but sometimes google isn't correct lol it says it may be implantation bleeding but I'm not even sure what that is or just my irregular period being irregular (like always) and it's just starting light but to watch it because it may get heavy ... I didn't go get a pregnancy test because I don't think I'm pregnant...but this normally doesn't happen even if I start suddenly it'll normally be a bright heavy red and My Panties normally be done for lol ...I'm kinda nervous, can you help me ??