)
I had a high-risk multiple birth pregnancy (twins) so my doctor asked me to keep track of when my periods were due through my
pregnancy. He asked me NOT to have sex
during that time each month because he felt it could cause me to miscarry. It made sense to me. Eventually, it wasn't worth the risk and we gave it up completely in the later months. Besides, it's hard to get 'in the mood' when you feel like a Macy's Thanksgiving Day parade balloon.