NSAIDs in pregnancy

significant risk of miscarriage – 

https://www.ncbi.nlm.nih.gov/pubmed/29890124

(small numbers but one series raised risk from 15% to 23% ) 

https://www.bmj.com/content/327/7411/368.long

science of ovulation and NSAIDS

https://link.springer.com/article/10.2165%2F00002018-200225080-00001

https://www.ncbi.nlm.nih.gov/pubmed/16493584

case series 2006

https://www.ncbi.nlm.nih.gov/pubmed/8646437

https://www.ncbi.nlm.nih.gov/pubmed/8624628

https://academic.oup.com/rheumatology/article/39/8/880/1784112

conference abstract, seems to have remained otherwise unpublished

Salman S, Sherif B, Al-Zohyri A. Effects of some non steroidal anti-inflammatory drugs on ovulation in women with mild musculoskeletal pain. Ann Rheum Dis. 2015;74(Suppl 2):117-118.

low dose aspirin after 12 weeks of pregnancy for specific indictions

https://www.ncbi.nlm.nih.gov/pubmed/24783270

NICE guidance