Frustration!

I am very frustrated right now! This surrogacy process has been riddled with problems this time. Just about every thing that could go wrong has. The parents are great! But I am just getting annoyed with the agency. I know these are things that may not be any fault of theirs but it doesn't make it easier to deal with. Here is my problem (this time!) I get paid a predetermined amount according to the contract and it starts at 8 weeks and continues every four weeks until delivery then I get the rest of the agreed upon amount. At 8 weeks I asked if they could send it early because we had a trip planned they said we can schedule it to be delivered on the day you are eight weeks but not before. I said great we didn't plan on leaving till the following day so it worked out good. Well that was a Friday and it didn't arrive that day or the next. It came on the following Monday. That was frustrating but as we all know the postal service is unpredictable. The next check came exactly 4 weeks later. Of course this means I would expect the next one four weeks after that. Monday or Tuesday it didn't come so I emailed the agency to see if they could check on it to see when it was sent out. She told me it was sent out Monday but it comes once a month so it won't be on the same day every time. I knew the contract said four weeks not a month, I know it is not a big difference but those of you who know me know that I am very particular and a big time planner so I need to know the exact date of each check so I can budget accordingly. When I told her that she looked into it and decided I was right (was there really any doubt) they would mail them every four weeks and sent me the scheduled mailing dates. Well again it was just a few days difference but to me a big deal, they scheduled to mail them 3 days after my weeks change. When in reality they were supposed to send them on the day the weeks turn which is Friday not the Monday dates they are now sending them. When I asked why they changed it the response was they are just going by the last one they sent and sending them every 4 weeks consecutively to that. Well that just screwed my previous budget to hell and back! I was expecting them to come on the day they are actually sending them out so now I have to adjust and change everything. This is not things that should be done to a pregnant woman. Needless to say I was thinking about whether or not to do this again with my age and multiple c-sections. Now I have to consider if I want to stay with the same agency again or find a new one. I am just very annoyed right now thanks for reading my venting.