So confused. Any input??

So my cycles have been 26 days since having my daughter 8 months ago. Except last cycle which was 28 days. Well this cycle I’m on day 30 (12 dpo) and still no period. I had a super tiny amount of pink when I wiped last night and thought I had started. I also had a super tiny amount of brown/red this morning and thought I started. But both amounted to nothing and I’ve never spotted before. No positive pregnancy tests though! Could I possibly be pregnant and just had implantation bleeding or should I definitely have a positive test by now?