Hi please can you help? My son has been a bit off colour for the last few days low fever/ sore throat/ headache. This morning he has woken with pink cheeks and a slight rash on his chest. I’m guessing he might have slapped cheek? I’m 16 weeks pregnant and have felt well in myself other than usual pregnancy stuff like tiredness and low level nausea. Do I need to have a blood test to check if I have it too or only if I develop the symptoms?