Is it possible?

So I got a positive OPK on 2/20 but had the flu and didn't BD... However I didn't notice any EWCM until several days later (2/25) we BDd on the 23rd and 25th... Af due tomorrow but I'm not feeling any symptoms (af or pg) and I noticed (TMI!) some yellowish cm today. I if course googled it and saw several people say they had yellow cm just before a BFP! So on a month where I didn't even think it was possible, I've convinced myself I could maybe be pregnant. Anyone think it's possible that I had my LH surge on 2/20 but Od late? Or am I just crazy?