trying to concive at 37 after one misscarige

hi i am 37 mother of 2 girls one 8 one 3 i recently had a misscaige back in jan 2011 my due date was sept 15 2011. i was just 7 weeks when i lost our baby im glad i got an ultrasound while the baby was alive at 6 weeks. its been tough at times this baby we lost was supossed to be our last. i sometimes cry and thing did i do something wronge i dont drink or smoke but one time i did take an asprin cause my gums were in such horrible pain due to hormonal changes then again i also had a really bad UTI . i ralize its nobody faualt but you can't help it. my way of moving on was enjoying the life i have now and keeping busy but everytime my period came i would get moody cause it was a reminder i was not pregnant the last time i got pregnant it took us 6 mos which blows my mind away cause we have BD every other day. well here we are trying again im now doing the BBT thing doesnt really help me much since my temp goes up and down depending if we have the fan on or how many blankets we use but over all i have general idea. we are looking forward to getting pregnant again although i know in my heart i will be very scared due to my age im at risk for misscarrige. so i hold on to faith and pray for my blessings while being thankful for the ones i have now.