Running in pregnancy, advice please!

[running3]

Hi, I had a bfp last weekend and am entered into a half marathon next weekend, so all being well will be 6 weeks pregnant. I've run for years and have done halfs before but training has been less consistent over the past year due to various things (hip injury, broken collarbone, mc) so I am a bit less fit than I had been. I had always planned to continue running when pregnant but I did 10miles last weekend (furthest in a long time, though I have been building up and obviously made sure I took it fairly easy) and it felt fine except I was panicking about getting too hot. Later that day i had a banging headache despite trying to stay extra hydrated. I have consequently bought a new running belt with a bigger bottle and plan to eat far more afterwards on my next run, but I still have a niggling doubt that perhaps I shouldn't do the half. Obviously I don't want to risk any harm to my baby. Am I being completely ridiculous to consider doing it, or am I being ridiculous to worry about it when my body knows running and has previously been pushed much further/harder? What would other pregnant runners do?!

[running3]

Hi Kitty, well done for keeping going! I've only managed a handful of runs since the half- tired and feel heavy!! I'm getting back on it this weekend though, and with lighter evenings coming there is no excuse that it's too dark/cold/horrible!