I am about to start IVF procedures. There is a schedule of injections, blood tests and sonograms. Depending upon when I get my period, it is possible that I might have to have a blood test on shabbos. I won’t know until probably the day of or before. Can I do this? If I can’t, the entire previous 3 weeks of medications and tests will be a waste and I will not be able to proceed with the retrieval. This will likely happen any time I try to do IVF. Thank you.