hello doctor, my age is 35 ,planning to have baby , i have missed my periods by 2 days ,i am taking thyronorm 100mg daily and cetapin XR 100mg . Is it safe to take cetapin now or shall i stop? my breasts have very much tender and sensative ,my back is aching and i am feeling little bit feverish. shall continue cetapin untill i do the pergnancy test? when shoulld i do pregnancy test?