Any input would be great

Hi ladies
​I have a very regular cycle..averages 28 days .. But lately has been 26 to 28.. I got my AF feb 14 till 19 then two day break.. Then brown light spotting for 9 days .. 
​Yesterday spotting turned red and was more frequent .. I thought AF was coming again.. Then today cd 18 I got my positive opk.. But still all day today medium spotting alternating between brown and red watery
​Is it possible to get pregnant if I'm spotting so much ?