Exercising whilst ttc

Hi I’m looking for some advice really ! We have been trying to conceive for 2 months now for our second child , after reading on here how long it can take people to get pregnant I decided I wanted to try exercising to get fit loose a little bit of weight ! My question is the class I went to yesterday was very intense ( I ache so much today I can barley walk ) is there any problems with doing intense exercise or any reason in which it would stop us actually conceiving ! I don’t want to keep on like I am thinking that I will get pregnant soon so it won’t matter if I have put on a few pounds here and there and be still trying months from now ? But I don’t want to exercise and it prevent us from conceiving ? I hope this makes sense ! Thank you in advance of any advice !