I really need help with abnormal 'period', leukorrhea, possible pregnancy?

This isn't as long as it seems, PLEASE read :(

I'm on the combined pill, but I missed two from the packet (separately) about 2 months ago and was advised to start my next pack straight away - so I took two packets back to back.

My bleed after this was late, by about 4 days, and not really a bleed at all; it was brown and dark, and so light that I only needed pantyliners, and this was completely different to normal.

Firstly, I'm not sure if that's just because of taking the two packets back to back or not (that was the first time I've done that).

I was concentrating so hard on what was going on with that, and on a lot of other things too that I forgot to go back on the pill on the right day, and in the book it says that you are protected if you start again on the right day.

I'm now experiencing leukorrhea for the first time, and there's no chance of STI, and I have no itching etc and it's unlikely that it's an infection.

What I'm trying to ask is could this give me a higher chance of being pregnant?

Also, how long into pregnancy does leukorrhea start, and how long after leukorrhea or conception can I take a home test?

Thanks.