AM PREGNANT FOR MY FIANCEE YOUNGER BROTHER, SHOULD I TELL HIM?

Good day admin,

I am a 33 years old lady from Edo state, a graduate of Economics  with a very good job.I am a very beautiful and attractive lady this made me have guys flocking around me.I met a guy i will like to call Lanre about eight months ago,and we are still together now. He is such a nice guy, He always showers me with gifts, he has a lot to spend on me cause he is from a wealthy home. I love Him too.

The problem started the very day Lanre took me home to meet his family. His people accepted me after introducing me to them, I really had a nice time with them. I was about leaving Lanre's house when a very handsome young man came in, Lanre told me this is Femi my younger brother, we shook hands and he was also a very nice guy also with a good sense of humor, we exchange numbers and I left. 
After meeting Femi it became impossible for me to take my heart off Femi, I started fantasizing being with him, his look and sense of humor attracted me to him and I wished it was Femi am dating and not Lanre.
After being restless for a couple of weeks, I invited Femi to my house to help me fix some things, He obliged me cause Lanre was out of the country. I dressed that day very seductively but he quickly fixed the things i asked him to help me fix and left. I re-invited him few days later and this time he fell galantly for me, we had sex together men it was great, it was the best sex I have had so far in my life. Having sex with Femi became a normal routine, we became very attached to each other, but deep down in my heart I was receiving a warning that this is not right but the pleasure put too much pressure on me to heed the warnings.

When Lanre came back  we also had a great sex, I was sleeping with two brothers, but I enjoyed Femi in bed than Lanre. I was enjoying my secret affairs with Femi until I met my water loo.

Last Month I was feeling funny and dizzy, I went for a medical check up and the doctor gave me a very bad news that I was three months pregnant. Immediately I knew that Femi was responsible for the pregnancy. That was the beginning of my night mare.I became very confused.

Please if you are reading my story now I need your candid advice on what to do. Should I tell Femi that am pregnant for him? What will happen if Lanre finds out? The thought of transferring the pregnancy to Lanre keeps coming to my heart, should I tell Lanre am pregnant for him when in the real sense it was Femi who owns the pregnancy,  I don't want to lose Lanre, am no more a baby I want to settle down in marriage.
Please tell me what to do cause I don't want  to be the one to scatter their happy family.

I feel like committing suicide now. Please somebody advice me before I do something stupid. I would have aborted the pregnancy had it not been that I was strictly warned by my doctor not to abort again or i will lose my life in the process.
Please help me out. Thanks.