I am 7 weeks. Up until today I have had minor cramping sometimes. This morning I did a yoga class that had some crunch like ab workout. Ever since I have had cramping all day and it's more medium intensity. I am wondering it the ab workout could have triggered a miscarriage. I track my BBT and I woke up at 2:30am so I decided to take my temp and it seems to have dropped. But this is not the normal time I take it. Any thoughts?