42 days and no menstration?

Hi I'm 22 years old and had a miscarriage last year in october. I was in my 9th week. I have had pretty consistant menstral cycles no longer than 35 days since , my leutal phase is usually 13 days long and I ovulate anywhere from cd18 and cd23. This month I ovulated on day cd27 on my bbt chart. my hubby and I have been trying again for a couple months as well. I know ovulating later would make my cycle longer this month. I am currently 11 days late for my period. 7dpo I started cramping like af and got a positive opk on 7dpo-10dpo. All hpts have been negative so far. I am currently on 15dpo and I feel crampy, but no signs of menstration yet??? My question is am I still early to get a positive hpt if pregnant? Also why was I getting positive opks but not hpts? I'm kinda worried...I have never in my life been late for a period more than seven days. Kinda concerned...any adivse would be greatly appreciated.