The fourth type of interruption is the one which often occurs a few days before and during the menstrual period and in some women at the time of ovulation. It must also be mentioned that when a woman becomes pregnant during treatment – and this is by no means uncommon – she at once ceases to lose weight. An unexplained arrest of reduction has on several occasions raised our suspicion before the first period was missed. If in such cases, menstruation is delayed, we stop injecting and do a precipitation test five days later. No pregnancy test should be carried out earlier than five days after the last injection, as otherwise the HCG may give a false positive result.
Oral contraceptives may be used during treatment.
Source: Pounds and Inches Manuscript