Is it possible? Could it be possible?

Cycles were on average 26-28 days long. Last 7 months they varied from 22 days to 30 days. Just started OPKs and temping this month. Last period was March 10th-15 with spotting and brown discharge on 16th and 17th. Hadn't started opks and temping yet tho. So, by 2 apps i use, it predicts ovulation at cd17. Then after that i was having clear stringy cm. But not a lot. Took a few OPKs bc of it, just they were NEG. So, last night we BD. Today I'm having more of the same CM. (plus, still leaking a bit from bd'ing) none of this makes sence to me. Also started having mild cramps, similar to my AF cramps. AF is "due" in 7 days. Could it be possible to conceive this close to "AF"? I don't understand the stretchy clear CM AFTER I supposedly ovulated. Is that common with anyone else? I know my cycles have been different lengths the last 7 months, but it always predicts AF down to the day,every month. I just don't know what to think. Any insight or honest opinions would be very helpful!! Thx a bunch everyone!!