Implantation bleed

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Hi ladies, this is my first time posting on this app so bear with me ☺

I was wondering if anyone knows anything about implatation bleeding? I didn't think it was very common but I see it coming up in topics all the time.

I have irregular periods (only 4 in total last year) and have been TTC for over a year. I have been seeing a Dr and am waiting to start my first round of Clomid next cycle. I have been tracking BBT and CM this cycle and am usually able to tell when I ovulate. I was sure I only ovulated on the 19/20th but woke up to what looks like AF this morning. I am usually crippled by the cramping for the first 2 days of AF before it settles but havent had any "normal" AF symptoms.

How common is implantation bleeding?

How heavy can it be?

Any info would be greatly appreciated xx