Unexplained infertility

My husband and I have been TTC for 2 years, we have had many tests which have all come back 'normal'. But I feel anything but normal! 
He has an 8 year old daughter from a previous relationship so I feel like it's my fault we haven't concieved yet. It's just awful!
I've just finished my 5th cycle of the fertility medication Clomid, only 1 cycle left. Next option is <a href="https://glowing.com/glow-fertility-program">IVF</a>, but at £5000 per go we can't afford it.