I did a sainsburys test today first wee but got a neg result. My cycle is 30-35 days, but the test says you can do it 4 days before period due. Would you take it as im likely not to be pg. I have 2 clearblue digital in the cupboard , and they also say you can do them early. I do keep on having heartburn which has gone on for the last few days and still got tender boobs at the sides, but now i just keep thinking am i imagining it as surely if i have got symptoms then there must be enough hormone to detect pregnancy IYSWIM. Advice please.