Hi so this is my second month ttc. I have a 28 day cycle. I started using opk on cd 7 - 9 then I was away for a few days and didn't test. When I returned home I tested ( cd 12) and appeared to get a strong positive. I usually test around 11am everyday. Tested again today (cd 13) still pretty strong line but slightly lighter than the day before. We dtd on cd 10,11,12 and will do again tonight. Could that be enough to fall pregnant. I also had some really achy cramping last night which I also wondered if that was ovulation. Any help or advice would be great thanks 