Can i prove to the court i did not forge the signature on the contract my ex and I made?

Hi, I'm 10 / 11 weeks pregnant and my ex is putting me thru hell and it is starting to physically wear down on me. On may 20 I loaned my ex, whom at the time was my fiance $200 for a speeding ticket he could not pay off, and I made him signed an agreement saying he would pay me back by June 15. A lot has happened since and now he is refusing to pay me back and is claiming I forged his signature on the agreement, in which I didn't. I have texts between us about the money and his mom also knows about this transaction since she to had to lend him money for the same reason but I now denying everything and is willing to lie in court. Now I am planning on taking him to small claims court to handle this is and the processing and fees I will have to pay by him causing me to do is causing me to stress and having a lot of belly pains and headaches. I am a college student with no job and pregnant so I have no money. When we go to court, could I request that he pay all the court fees? How can I prove to the court I did not forge his signature? Do you think there is anyway I will win this in court? Please I really need some advise on what to do. I have been begging him since we broke up to not put me thru this for the baby sake ( he is the father ) so that I can move on, leave him alone, and b stress free since its harmful to the baby