not preventing pregnancy right after miscarriage?

Mackenzie
I had a miscarriage a 5w4d on 1/15/17--- when I got my hcg the next day it was 5. I bled for 8 days and have felt fine ever since.
My OB said it's safe to try after your next cycle. Well we used condoms over the weekend when my normal ovulation time would have been-(had some minimal EWCM, nothing like the month we conceived) but this week we've BD twice without prevention bc I thought I was past my o-time.... and today I took an OPK and it gave me a "peak" reading. 😳 
I'm read WAY too much online about how why you should wait to get pregnant again after a miscarriage- and then I've read that it's safe as long as your ready and your body wouldn't get pregnant again unless it was ready.... 
I'm just scared that we may conceive this month-- no clue when AF will show bc if the miscarriage but at this point im only about 3 days off what my cycles were before...
Anyone have a similar experience??