Hallow my friend Laura, You have taken right step. Plan B emergency contraceptives are very effective in preventing pregnancy when taken within 72 hours. You have consumed it within one hour. Whether you swallow the pill or you drink after dissolving in water does not make any difference. It will act. You need not take your pregnancy test immediately. Wait for your menses to appear. Due to emergency contraceptive pill, it may be delayed by few days. If you miss period, then only you may think of performing pregnancy test on the overnight first morning urine sample after 8-10 days of missed period. Earlier, these tests may give false negative results. Alternatively, you may go for Beta hCG test which can give you reliable results even few days before you miss a period. However, I feel this should not be necessary. Here I would like to give you some tip about the use of condom. Before wearing condom, its tip should be pinched in the fingers to expel the air in it and then it should be worn. Otherwise the air trapped in the tit increases the pressure during ejaculation and then there is risk of bursting of condom . I hope this helps you today, Dr. Nishikant Shrotri